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Q.

A body of mass 10kg  moving on a horizontal surface with a velocity of  10ms−1 comes to rest in 2.5s . The force required to make this body move with a velocity of 10ms−1 on the same surface is

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a

Zero

b

40N

c

25N

d

50N

answer is B.

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Detailed Solution

F=m(v−ut)=10(10)2.5=40N
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