Collision and Friction :: Discussion


8.A ball is thrown vertically upwards with a velocity of 20m/s. At what height, will its kinetic energy be half its original value?
A.10.20m
B.10m
C.15m
D.5m
Answer:  Option  A
Explanation:

Work done against gravitation = Change in kinetic energy
mgh = 1/2 mv2-1/2×1/2 mv2
h = v2/4g= 10.20m.

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Published by:Michael Daani

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