Chapter 9 definitions/questions

as a shuttle bus comes to a normal stop, it slows from 9.00 m/s to 0.00 m/s in 5 seconds. Find the average acceleration of the bus

-1.8 m/s 2

you are traveling in a car that is moving at a velocity of 20 m/s. Suddenly, car a 10 meters in front of you slams on t's brake. At the moment, you also slam on your brakes and slows down to 5 m/s. Calculate the acceleration if it took 2 seconds to slow you car down.

-7.5 m/s 2

a skater goes from a standstill to a speed of 6.7 m/s in 12 seconds. What id the acceleration of the skater?

0.56 m/s 2

a lizard accelerates from 2 m/s to 10 m/s in 4 seconds. what is the lizard's average acceleration?

1 m/s 2

a runner covers the last straight stretch of a race in 4 seconds, during that time, he speeds up from 5 m/s to 9 m/s. what is the runner's acceleration in this part of the race?

1 m/s 2

a car advertisement states that a certain car can accelerate from rest to 70 km/h in 7 seconds. Find the car's average acceleration?

10 km/h 2

the Rocky Mountain Cruiser covers 3105 miles in 27 hours, what is its speed?

115 m/hr

during a race a sprinter increases from 5.0 m/s over a period of 1.25 seconds. What is the sprinter's average acceleration during this period?

2 m/s 2

a cyclist accelerates from 0 m/s to 8 m/s in 3 seconds. What is his acceleration? Is the acceleration higher than a car which accelerates from 0 to 30 m/s in 8 seconds?

2.67; no it's not higher

a roller coaster rapidly picks up speed as it rolls down a slope. AS it starts down the slope, its speed is 4 m/s. But 3 seconds later, at the bottom of the slope, its speed is 22 m/s. What is the average acceleration?

6 m/s 2

a ball is dropped from the top of a building. after 2 seconds, it's velocity is measured to be 19.6 m/s. Calculate the acceleration for the dropped ball

9.8 m/s 2

motions

a change in position measured by distance and time

acceleration graphs

shows the starting velocity and the final velocity of moving objects

speed graphs

shows velocity, shows the speed of an object

units for speed

steady acceleration steady speed gradual acceleration steady deceleration

speed

tells me the rate at which an objects moves