AP Review: Kinematics (1D & 2D)

An object that's moving with constant speed travels once around a circular path. Which of the following statements are true concerning the motion? Select two answers.

• The displacement is zero

• The average speed is zero

• The acceleration is zero

• The velocity is changing

Which of the following statements are true about uniformly accelerated motion? Select two answers.

• If an object's acceleration is constant, then if must move in a straight line

• If an object's acceleration is zero, then its speed must remain constant

• If an object's speed remains constant, then its acceleration must be zero

• If an object's direction of motion is changing, then its acceleration is not zero

A baseball is thrown straight upward. What is the ball's acceleration at its highest point?

How long would it take a car, starting from rest and accelerating uniformly in a straight line at 5 m/s² , to cover a distance of 200 m?

• 9.0 s

• 10.5 s

• 12.0 s

• 15.5 s

A rock is dropped off a cliff and strikes the ground with an impact velocity of 30 m/s. How high was the cliff?

• 20 m

• 30 m

• 45 m

• 60 m

A stone is thrown horizontally with an initial speed of 10 m/s from a bridge. Assuming that air resistance is negligible, how long would it take the stone to strike the water 80 m below the bridge?

• 1 s

• 2 s

• 4 s

• 8 s

A soccer ball, at rest on the ground, is kicked with an initial velocity of 10 m/s at a launch angle of 30^o. Calculate its total flight time, assuming that air resistance is negligible.

• 0.5 s

• 1 s

• 2 s

• 4 s

A stone is thrown horizontally with an initial speed of 30 m/s from a bridge. Find the stone's total speed when it enters the water 4 seconds later, assuming that air resistance is negligible.

• 30 m/s

• 40 m/s

• 50 m/s

• 60 m/s

Which one of the following statements is true concerning the motion of an ideal projectile launched at an angle of 45^o to the horizontal?

• The acceleration vector points opposite to the velocity vector on the way up and in the same direction as the velocity vector on the way down

• The speed at the top of the trajectory is zero

• The object's total speed remains constant during the entire flight

• The vertical speed decreases on the way up and increases on the way down.

A stone is thrown vertically upward with an initial speed of 5 m/s. What is the velocity of the stone 3 seconds later?

• 25 m/s, upward

• 25 m/s, downward

• 35 m/s, upward

• 35 m/s, downward