Question

# Below part D is a multiple-flash picture of a ball rolling on a smooth surface, left...

Below part D is a multiple-flash picture of a ball rolling on a smooth surface, left to right. The flashes come at equal time intervals.

(A) Is the ball moving at constant velocity? How do you know?

(B) If not, where is it fastest?

(C) Where is the acceleration (if any) greatest in magnitude?

(D) Do acceleration and velocity have the same sign anywhere here? If so, where?

o     o     o     o     o o o o o o o o

here,

a)

from the pictures we can see that the ball distance traveled in each second decrease

so, it is not moving at constant velocity

b)

initially the ball is fastest

c)

the acceleration is greater in magnitude when the distance traveled by ball in each time interval decreases

d)

No, as the distance traveled is decreased

the ball will slow down

the acceleration is in opposite direction to the velocity

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