An 8 kg body performs SHM of amplitude 30cm . The restoring force is 60N when the displacement is 30cm. find the potential energy and kinetic energy when displacement is 12cm .

When a spring is stretched by 10 cm, the potential energy stored is E. When the spring is stretched by 10 cm more, the potential energy stored in the spring becomes

After a collision with an ideal spring , a body of mass 8g , moving with a constant velocity of 10 cm *s^(-1) comes to rest. Force constant of the spring is 200 dyn *cm ^(-1) . If the total kinetic energy of the body is spent in compressing the spring , find the compression.