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A constant retarding force of 50 N is ap...

A constant retarding force of 50 N is applied to a body of mass 20 kg moving initially with a speed of `15ms^(-1)` How long does the body take to stop ?

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`a = -2.5 ms^(-2)` , using `v= u + at , 0 = 1 - 2.5 t i.e., t = 6.0 s`
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