A system of two masses, a spring and a pulley are at rest at the instant represented in the figure. At that very moment, the spring is totally relaxed. The pulley has a negligible mass, the mass m has a value of 0.770 kg, and the spring constant is k = 30.0 N / m.

(a) Imagine that the system is released from the situation represented in the figure and therefore the mass 2m begins to descend. For what value of y is the instantaneous speed of the masses zero?

(b) Derive an expression for the instantaneous speed as a function of y

(c) For what value of y does the system move with its maximum speed?

m www 2m y