What is the change in potential energy of an energetic 72 kg hiker who makes it from the floor of death valley to the top of mt. whitney?

Aspring with a mass of 2 kg has a damping constant 14 kg/s. a force of 3.6 n is required to keep the spring stretched 0.3 m beyond its natural length. the spring is stretched 0.6 m beyond its natural length and then released. find the position of the mass at any time t. (assume that movement to the right is the positive x-direction and the spring is attached to a wall at the left end.)

What object a collides with object b and bounces back its final momentum is?

What is the major limitation to the light microscope?