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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 |
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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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