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

MTech

F=ma 50= 20 x a a = 2.5m/s^2 v = u+at Here is a is -ve to stop 0 = 15 - 2.5xt 2.5t = 15 t = 6 So, it will take 6 seconds the body to stop

PASSED B.TECH (APPLIED PHYSICS) B.SC (PHYSICS HONS)FROM C.U.

Time 6 secs

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