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A ball of mass 0.4 kg starts rolling on the ground at 20 ms–1 and comes to a stop after 10s. Calculate the force which stops the ball, assuming it to be constant in magnitude throughout.

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 Given m= 0.4 kg, initial velocity u = 20 ms–1, final velocity v = 0 m s–1 and t = 10s. So

Here negative sign shows that force on the ball is in a direction opposite to that of its motion.

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