A block of mass m = 4 kg is attached to a spring of constant, k = 32 N/m by a rope that hangs over a pulley of mass M = 8 kg. If the system starts from rest with the spring unstretched, find the speed of the block after it falls 1 m.

Q: A block of mass m = 4 kg is attached to a spring of constant, k = 32 N/m by a rope that hangs over a pulley of mass M = 8 kg. If the system starts from rest with the spring unstretched, find the speed of the block after it falls 1 m. (Treat the pulley as a disc)

Numerical

(a) 1.2 ms-1

(b) 2.8 ms-1

(c) 2.4 ms-1

(d) 1.8 ms-1

Ans: (c)