a body is moving with the intial velocity 20m/s on a rough surface . the velocity of the body decreases at the rate of 0.4m/s^2 due to friction after how much time will the body stop .
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it is given in question that ---
u = 20m/s , v= 0 , a = -0.4m/s^2
now putting these value in equation v = u + at ( a is negative)
we got time = 50s
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