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Q.

A vehicle of mass 20kg is moving with a velocity of4ms−1 . Find the magnitude of the force that is to be applied on the vehicle so that the vehicle have a velocity of 1ms–1 after travelling a distance of 20m .

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a

4 N

b

6 N

c

7.5 N

d

9.5 N

answer is C.

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Detailed Solution

F=m(v2−u22s)      =20(1−162×20)     =−152=7.5N
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