A spring with a force constant of 240 N/m is stretched 20 cm from its equilibrium position. Calculate the elastic potential energy stored in the spring.

John throws .4 kg ball with velocity of 18 m/s. hits .2 kg bottle and bottle flies 25 m/s. how fast is ball traveling after hitting the bottle?

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

The california mussel (mytilus californianus) attaches itself to a rock or other solid surface with a bundle of filaments known as the byssus. imagine that 15.0 j of work is done to stretch the distal end of the byssus. it releases 10.8 j of thermal energy as it relaxes. what is the resilience of the distal end of the byssus?