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A particle moves in the x-y plane under the influence of a force such that its momentum is p(t) = A[i cos(kt) – j sin(kt)]. Where A and k are constants. The angle between the force and momentum is

A body of mass 2 kg travels according to the law x(t) = pt+qt2 + rt3 where, q=4ms 2, ,p=3ms-1,r = 5ms 3. The force acting on the body at t = 2s is

N small balls each of mass m impinge elastically each second on a surface with velocity u. The force experienced by the surface will be

Swimming is possible on account of

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