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Question

A force F acts horizontally on a block of mass m that is initially at rest on a smooth horizontal floor. The force acts for a time t and moves the block a displacement d.
Find out the change in momentum of the block ?

A
Ft
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B
mt
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C
Fd
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D
Ft
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E
mt
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Solution

The correct option is E Ft
Net force acting on the block = F
Time for which the force acts =t
Using momentum-force relation, we get ΔP=F×t

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