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Q.

If the kinetic energy of a body is directly proportional to time t, the magnitude of the force acting on the body is

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a

directly proportional to  t

b

inversely proportional to  t

c

directly proportional to the speed of the body

d

inversely proportional to the speed of the body

answer is B, D.

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Detailed Solution

12mv2=a(t)

or            v∝t1/2

a=dvdt∝t−1/2

or             F∝1t  and  F∝1v

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