A body of mass 3 k g acted upon by a constant force is displaced by S metre, given by relation S = 1 3 t 2 , where t is in second. Work done by the force in 2 seconds is :

Question

A body of mass 3 k g acted upon by a constant force is displaced by S metre, given by relation S = 1 3 t 2 , where t is in second. Work done by the force in 2 seconds is :, 8 / 3 J, 19 / 5 J, 5 / 19 J, 3 / 8 J

MARKS App · Accepted Answer

S = t 2 3 v = d S d t d S d t = 2 3 t = v ; W = ∆ K = K t = 2 - K t=0 W= 1 2 m v t = 2 2 - v t = 0 2 = 1 2 ⋅ 3 16 9 - 0 = 8 / 3 J

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