1.

et of weight W' dropped from aStrikes the ground and comes to restardation equal to twice the accelerationot gravity. The force exerted on thegrounds is4) 4W

Answer»

Force exerted is equal to the change in momentum in one second. Now, retardation is rate of decrease of velocity. The value of retardation is given as 2g. Then,

Force, F=dp/dt=m(dv/dt). But,

m=W/g and dv/dt=2g, therefore ,

F=(W/g)(2g)=2W



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