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[" 3.A simple pendulum,made of astring of length "],[l" and a bob of mass "m," is released from a small "],[" angle "theta_(0)." It strikes a block of mass "M," kept on "],[" a horizontal surface at its lowest point of "],[" oscillations,elastically.It bounces back "],[" and goes up to an angle "theta_(1)." Then "M" is given "],[" by : "],[[" (1) "(m)/(2)((theta_(0)+theta_(1))/(theta_(0)+theta_(1)))," (4) "m((theta_(0)-theta_(1))/(theta_(0)+theta_(1)))],[" (3) "m((theta_(0)+theta_(1))/(theta_(0)-theta_(1))),(4)m((theta_(0)-theta_(1))/(theta_(0)+theta_(1)))]]

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