A ball is thrown vertically upwards with a certain velocity. Then

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at the highest position work done by gravity is not defined

during its upward motion work done by gravity is negative

during the complete motion work done by the gravity is zero

during its downward motion work done by gravity is positive

answer is A, B, C, D.

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Detailed Solution

A. upward motion $W = - m g h (- v e)$
B. downward motion $W = + m g h (+ v e)$
C. at highest point velocity becomes zero
D. one complete motion displacement is zero then work done by gravity is zero

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