10. A ball is thrown vertically upward from the surface of the earth. quantities

Question

10. A ball is thrown vertically upward from the surface of the earth. quantities:

(1) the acceleration of the ball; (2) the velocity of the ball;

Consider the following

(3) the speed of the ball.

Which of these is (are) constant when the ball has reached the maximum height?

A) 1 and 2 only

B) 1 only

C) 2 only

D) 3 only

E) 1, 2, and 3

4. A race car will make one lap around a circular track of radius R. When the car has traveled aquarter turn around the track, what is the magnitude of the car's displacement from the starting point?
A) 2R

B) R
C) piR/2 D) 2piRE) 3/2

Explanation / Answer

10.

B) 1 only

acceleration of the ball is due to gravity and remains constant in downward direction throughout its motion.

11.

magnitude of car's displacement = sqrt(R2 + R2) = sqrt(2) R

A) 2R

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