Suppose the force of wind resistance is proportional to the speed of the object

Question

Suppose the force of wind resistance is proportional to the speed of the object and in the direction opposite the objects velocity. If you throw an object upward, when is the magnitude of the acceleration the highest?

A) it is the highest right after the object is released
B) it is the highest at the top of its trajectory
C) the acceleration of the object is the same throughout the entire trajectory

A golfer plays a putt stroke on a level green, hitting ball A toward the hole. She strikes the ball perfectly, giving it just the right initial speed (v) so that after slowing on the grass the ball just reaches the hole and falls into it.
Her partners ball B lies twice as far from the hole. In order for ball B to just reach the hole, at what speed must it be traveling immediately after being struck? Assume a constant retarding force on the grass.
A) 2v
B) v
C) square root of 2v D) 4v C) square root of 2v D) 4v

Explanation / Answer

answer (a), the acceleration is highest at highest point. answer (c), v^2 is prapotional to the distance.

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