A particle, P, of mass 3 kg, rests on a rough, horizontal table, where = 2/3.

A particle, P, of mass 3 kg, rests on a rough, horizontal table, where µ = 2/3. P is 3 attached to a light, elastic string of natural length 2in and modulus of elasticity 49 N. The string passes over a smooth, fixed pulley at the edge of the table and is then attached to a particle, Q, of mass 1 kg. Q is held at the same level as the pulley and released. Given that P is initially 1 m from the pulley, find the speed of Q at the instant P begins to move.