Q.
A body of mass ‘M’ collides against a wall with a velocity v and retraces its path with the same speed. The change in momentum is (take initial direction of velocity as positive)
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a
Zero
b
2Mv
c
Mv
d
– 2 Mv
answer is D.
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Detailed Solution
Change in momentum=mv2¯−mv1¯=−mv−mv=−2mv
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