Physics 101 Question Set 3

A baseball is tossed upward with an initial velocity of +24 m/s, rises to some high position, and then falls back down to be caught at its original release position. What is the value of its acceleration 4 seconds after release?

-10 m/s/s

A baseball is tossed upward with an initial velocity of +24 m/s, rises to some high position, and then falls back down to be caught at its original release position. What is the value of its acceleration half-way up to its highest point?

-10 m/s/s

A baseball is tossed upward with an initial velocity of +24 m/s, rises to some high position, and then falls back down to be caught at its original release position. What is the value of its acceleration immediately after release?

-10 m/s/s

A baseball is tossed upward with an initial velocity of +24 m/s, rises to some high position, and then falls back down to be caught at its original release position. What is the value of its acceleration immediately before being caught?

-10 m/s/s

A baseball is tossed upward with an initial velocity of +36 m/s, rises to some high position, and then falls back down to be caught at its original release position. What is the value of its acceleration at its highest point in the air?

-10 m/s/s

A baseball is tossed upward with an initial velocity of +36 m/s, rises to some high position, and then falls back down to be caught at its original release position. What is the value of its acceleration immediately after release?

-10 m/s/s

A baseball is tossed upward with an initial velocity of +36 m/s, rises to some high position, and then falls back down to be caught at its original release position. What is the value of its acceleration immediately before being caught?

-10 m/s/s

What is the average acceleration of an object whose velocity changes from 18 m/s to 10 m/s in 4.0 s?

-2 m/s/s

What is the average acceleration of an object whose velocity changes from 18 m/s to 10 m/s in 2.0 s?

-4 m/s/s

An object covers a distance of 8 meters in the first second of travel, another 8 meters during the next second, and 8 meters again during the third second. Its acceleration in m/s/s is approximately

0

An object's position (in meters) as a function of time (in seconds) is modeled by the equation x(t) = 5t + 4. What was the acceleration of this object?

0

An object travels 5 m east in 6 s, stops for 3 s, and then travels 15 m west in 11 s. The magnitude of its average velocity for the entire trip was

0.50 m/s

If you drop an object, it will accelerate downward at a rate of 10 m/s/s. If you instead throw it downwards, its acceleration (in the absence of air resistance) will be

10 m/s/s

If a uniformly accelerating object travels 40 cm in 1 second, how far will it travel in 2 seconds?

160 cm

An object's position (in meters) as a function of time (in seconds) is modeled by the equation x(t) = 5t2 + 4t + 2. What was the initial position of this object?

2 m

A vacationing family travels east in their car for 4 hours at an average speed of 50 mph, stops to visit a museum for 4 hours, and then travels east 2 more hours at an average speed of 40 mph. What was their average speed for the entire trip?

28 mph

An object is released to fall freely through the air. What is its speed 3.0 seconds after release?

30 m/s

If a uniformly accelerating object travels 40 cm in 1 second, how far will it travel in 3 seconds?

360 cm

What is the initial position of an object that is modeled mathematically by the equation x(t) = -4t + 3, where x(t) is in meters when t is in seconds?

3m

If a uniformly accelerating object travels 50 cm in 2 seconds, how far will it travel in 6 seconds?

450 cm

An object's position (in meters) as a function of time (in seconds) is modeled by the equation x(t) = 4t2 + 5t + 3. What was the initial velocity of this object?

5 m/s

If a car increases its velocity from zero to 60 km/h in 10 seconds, its acceleration is

6 km/h/s.

If a car accelerates from rest at 2 m/s/s, its speed 3 seconds later will be about

6 m/s.

A bullet is fired straight down from the top of a high cliff. Neglecting air resistance, the acceleration of the bullet in m/s/s

Is 10.

Objects that are slowing down in the positive direction have Distance vs Time graphs that

curve upward and get flatter

A negative velocity implies that an object

is moving in the negative direction.

A positive velocity implies that an object

is moving in the positive direction.

A negative displacement implies that an object

moved in the negative direction.

The faster an object travels, the ____________________ its "Distance vs Time" graph will be.

steeper

A negative acceleration implies that an object's

velocity is decreasing.

A positive acceleration implies that an object's

velocity is increasing.