Suppose a ball is dropped from shoulder height, falls, makes a perfectly elastic

Question

Suppose a ball is dropped from shoulder height, falls, makes a perfectly elastic collision with the floor, and rebounds to shoulder height. Compare the magnitudes of the impulses delivered to the ball by gravity and by the floor during this entire motion.

a) the floor delivers an upward impulse, but gravity does not deliver a total impulse
b) the two impulses have the same magnitude
c) the impulse delivered by the floor is half as large as the impulse delivered by gravity
d) the impulse delivered by the floor is twice as large as the impulse delivered by gravity

Explanation / Answer

b) the two impulses have the same magnitude

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