A 70.0-kg skier is sliding at 4 m/s when they slide down a 2-m-high hill. At the bottom of the hill they run into a large 2800 N/m spring. How far do they compress the spring before coming momentarily to rest?

The compression of the spring is 0.633 m.

Explanation:

Given;

mass of the skier, m = 70 kg

speed of the skier, v = 4 m/s

spring constant of the spring, k = 2800 N/m

At the bottom of the hill the kinetic energy of the skier will be maximum while the potential energy will be zero, thus all the mechanical energy of the skier will be converted to kinetic energy.

Apply the law of conservation of energy;

the kinetic energy of the skier at the bottom hill = elastic potential energy of the spring.

where;

x is compression of the spring

Therefore, the compression of the spring is 0.633 m.

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )