1.

A horizontal spring block system executes SHM with amplitude A = 10 cm initial phase phi =0 and angular frequency omega. The mass of block is M = 13 kg and there is no friction between the block and the horzontal surface. The spring constant being 2500N/M At t = t_(1) sec [for which omega t_(1) = phi_(1) = 30^(@)]. A mass m = 12 kg is gently put on the block. [Assume that collision between the block adn the mass is perfectly inelastic and mass m remains stationary w.r.t. the block M always] The total energy of system after collision at any moment of time is

Answer»

4 joule
8 joule
12 joule
none of these

Answer :B


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