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A horizontal spring block system execute...

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 new angular frequency of the system will be

A

10 rad/sec

B

15 rad/sec

C

20 rad/sec

D

none

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The correct Answer is:
A
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