Unit 2- Elementary Mechanics AB Chapter 13: Linear Velocity and Acceleration
A train starts from rest and increases its speed uniformly for three minutes. In that time it reaches a speed of 150 km/h. What is its acceleration in m/s²?
0.23 m/s2
A car is traveling at 85 km/h. How far it will travel in 8 seconds. (Answer to 3 decimal places)
188.889
288) The SI unit for acceleration is 2 a) m/s 3 b) m/s c) m/s d) km/h e) km/s
2 a) m/s
A car is traveling at 85 km/h. Its speed in m/s (Answer to 3 decimal places)
23.611
A car is traveling at 85 km/h. What is the average speed in km/h, if the time to travel 140 km is 1 hour and 50 minutes? (Answer to 3 decimal places)
76.364
How long in seconds it takes to cover 2 km.
85
Acceleration is defined as the rate of change of: a) velocity b) speed c) distance d) time
a
290) A car travelling at 90 km/h is brought to rest over a distance of 120 m. What is the acceleration in metres per second squared? a) 2.6 . b) -2.6 c) 1.3 d) -1.3 e) -2.0
a) 2.6 v2= u2 + 2as, a= v2-u2/2s, a= ((90-0)km/hr x 1000m/3600s)/(2 x 120m),vel, dist conversion are exp 2.
A train is traveling at 90 km/h. Find the following: a) Its speed in m/s b) How far it will travel in 7 seconds c) How long it takes to cover 4 km d) The average speed in km/h, if the time to travel 130 km is one hour and 40 minutes
a) 2250 m/s b)15750 m c) approx. 3mins d)83.23 km/hr
277) An airplane travels 500 km due west in 2 hours. Its average velocity is a) 250 m/s due west b) 4167 m/s due west c) 69.4 m/s due west d) 69.4 m/s due east e) 1000 km/h due east
a) 250 m/s due west
291) The area under a velocity vs. time graph equals: a) distance b) speed c) acceleration d) displacement e) average velocity
a) distance
276) A vehicle that travels 150 km in 3 hours, a) has a velocity of 50 km/h b) has an average speed of 50 km/h c) has a relative velocity of 50 km/h d) covers a distance of 50 km e) has a velocity of 750 km/h
a) has a velocity of 50 km/h
A car traveling with an initial speed of 40 km/h accelerates uniformly to 120 km/h in two minutes. What distance is traveled during the acceleration period?
a= (u + v/ t)= 0.185 m/s2
A body moves 180 degrees from Point A to Point B in a semicircular path. The radius of the semicircle is 8 m. Calculate the displacement between Point A and Point B. a) 25.13 m b) 16 m c) 8 m d) 12.57 m e) 50.27 m
b
A car traveling at 90 km/h is brought to rest over a distance of 120 m. What is the acceleration in meters per second squared? a) 26 b) -2.6 c) 1.3 d) -1.3 e) -2.0
b
An object impacts the ground with a velocity of 32.25 m/s. From what height was the object dropped? Answer is in m. (Express the answer to 1 decimal place) a) 28.4 m b) 53.0 m c) 53.55 m d) 19.8 m e) 186 m
b
279) Velocity is a) a scalar quantity b) a vector quantity c) a standard quantity d) an average quantity e) a maximum quantity
b) a vector quantity
A car traveling at 18 km/h increases its velocity uniformly to 62 km/h in 10 seconds. What is the acceleration? a) 122 m/s b) 12.2 m/s c) 122 m/s² d) 1.12 m/s² e) 0.112 m/s²
c
A train traveling at a speed of 110 km/h decelerates for 40 seconds. During that time it travels 450 m. What is its speed after the deceleration in km/h? a) 28 km/h b) 28.5 km/h c) 29 km/h d) 29.5 km/h e) 30 km/h
c
An airplane travels 250 km due West for 2 hours. Its average velocity is: a) 250 m/s West b) 69.4 m/s East c) 34.722 m/s West d) 150 m/s West e) 500 km/h East
c
273) A body moves from Point A to Point B in a semicircular path. The radius of the semicircle is 2 m. Calculate the displacement between Point A and Point B. a) 2 m b) 4 m c) 6 m d) 8 m e) 10 m
c) 6 m
A train traveling at a speed of 150 km/h decelerates for 15 seconds. During that time it travels 200 m. What is the deceleration in m/s²? a) 1.278 m/s² b) 18.87 m/s² c) 1.887 m/s² d) -3.778 m/s² e) 17.78 m/s²
d
The area under a velocity vs. time graph equals: a) distance b) speed c) acceleration d) displacement e) average velocity
d
295) An object is dropped from a height of 45 m. What will its velocity be on impact? a) 882.9 m/s b) 441.5 m/s c) 22.50 m/s d) 29.71 m/s,. e) 31.76 m/s
d) 29.71 m/s,. use formula on table
271) According to Newtons laws of motion which statement is false? a) A body at rest will remain at rest unless acted upon by an external force. b) If a body is acted upon by an external unbalanced forcethe body will have an acceleration in the direction and proportional to the magnitude of the force. c) For every action there is an equal and opposite reaction. d) A body in motion will come to rest unless acted upon by an external unbalanced force. e) When one object exerts a force on a second object the second object exerts a reactive force of equal magnitude and opposite direction on the first object.
d) A body in motion will come to rest unless acted upon by an external unbalanced force.
A vehicle that travels 150 km in 3 hours a) has a velocity of 750 km/h b) covers a distance of 50 km c) has a relative velocity of 50 km/h d) has a velocity of 50 km/h e) has an average speed of 50 km/h
e
289) A car travelling at 18 km/h increases its velocity uniformly to 48 km/h in 6 seconds. What is the acceleration in metres per second squared? a) 1.12 b) 1.23 c) 1.39 d) 1.45 e) 1.57 .
e) 1.57 ave. vel.= ((18+48 km/hr)/2 x 1000m/ 3600s)/6 s
A car traveling at a speed of 140 km/h decelerates for 20 seconds. During this time it travels 500 m. a) What is its deceleration? b) What is its speed after the deceleration?
v= u + at, s=ut +1/2 at2, a =2(s-ut/t2)= 2(s-u/t) a) -1.3 m/s2 dec. b) 12 m/s