freely falling objects

In a race, a runner traveled 12 meters in

4.0 seconds as she accelerated uniformly from

rest. The magnitude of the acceleration of the

runner was ______.

• 0.25 m/s2

• 1.5 m/s2

• 5 m/s2

• 5.6 m/s2

A ball is thrown vertically upward as shown in

the figure below. At what point in the ball’s path does

it experience zero velocity and nonzero acceleration

at the same time?

• P

• Q

• R

• S

A student throws a baseball vertically upward

and then catches it. If vertically upward is considered

to be the positive direction, which graph best

represents the relationship between velocity and

time for the baseball?

• 
• 
• 
• 

An object is projected vertically upward from the

ground with a velocity of 30 𝑚/𝑠. What is its time of

the flight if it reaches back to the ground?

• 0.7 s

• 1 s

• 6 s

• 9 s

Saeed throws a stone downward with a speed of

3.0 𝑚/𝑠 from a balcony. How high is the balcony from

the ground if it takes the stone 1.0 𝑠 to reach the

ground?

• 8 m

• 7 m

• 6 m

• 3 m

A baseball is thrown vertically upward. What is

the ball’s velocity and acceleration at its highest

point?

• v=0 and a=0

• v=g and a=0

• v=0 and a=-g

• v=g and a=-g

At what time is the object’s velocity zero?

• 1 S

• 2 S

• 3 S

• 4 S

A ball falls freely from rest for 5.0 s. calculate the

ball’s velocity

• 78 m/s

• 147 m/s

• -78 m/s

• -147 m/s

A stone is thrown vertically downwards with a

velocity of 5.00 m/s. What is the stone’s speed

2.00 s after it is thrown?

• 10 m/s

• 15 mm/s

• 20 m/s

• 25 m/s