Physics

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

(A) 0
(B) \frac{1}{2}g, downward
(C) g, downward
(D) \frac{1}{2}g, upward
(E) g, upward
Physics

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 ?

(A) 9.0 s
(B) 10.5 s
(C) 12.0 s
(D) 15.5 s
(E) 20.0 s
Physics

An object that’s moving with constant speed travels once around a circular path. True statements about this motion include which of the following?

(I) The displacement is zero.
(II) The average speed is zero.
(III) The acceleration is zero.

 

(A) I only
(B) I and II only
(C) I and III only
(D) III only
(E) II and III only
Physics

Which of the following must always be true?

(I) If an object’s acceleration is constant, then it must move in a straight line.
(II) If an object’s acceleration is zero, then its speed must remain constant.
(III) If an object’s speed remains constant, then its acceleration must be zero.

 

(A) I and II only
(B) I and III only
(C) II only
(D) III only
(E) II and III only
Physics

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

(A) 15 m
(B) 20 m
(C) 30 m
(D) 45 m
(E) 60 m