Question

A mechanic strikes a nail with a hammar of mass 500 grams moving with the velocity of 20 meter per second. The hammar comes to rest in 0.025sec after striking the nail. Calculate the force exerted by the nail on the hammar

Answer 1

F = ma

since m = 500gm = 0.5kg

a= Vf - Vi/t

a = 0 - 20/ 0.025

a =  -800 m/s^2

now, for Force

F = ma

F = 0.5(-800)

F = -400N