Question

1- a 0.250 kg egg-drop project is at the top of the 14 meter tall stadium. what is the projects potential energy?

2- Jason has decided to become a jockey. he and his horse have a combined mass of 550 kg, and they are traveling at 15 m/s when they cross the finish line (in first place !) what is their kinetic energy ?

3- a 0.5 kg ball is at the top of a 20 meter tall hill.

a) What is the ball's kinetic energy ?
b) what is the ball's potential energy ?
c) what is the ball's mechanical energy ?

4 - a 2.0 kg toy has been thrown in the air it is 1.5m above the ground and is moving up at 3.0 m/s

a) What is the toy's kinetic energy ?
b) what is the toy's potential energy ?
c) what is the toy's mechanical energy ?

Answer 1

1. The potential energy is 34.3J

2. The kinetic energy is 61,875J.

3. A 0.5 kg ball is at the top of a 20 meter tall hill.

a) What is the ball's kinetic energy ? The ball's kinetic energy is zero.
b) what is the ball's potential energy ? The ball's potential energy is 98.1J.
c) what is the ball's mechanical energy ? The ball's mechanical energy is 98.1J.

4. 2.0 kg toy has been thrown in the air it is 1.5m above the ground and is moving up at 3.0 m/s

a) What is the toy's kinetic energy ? The toy's kinetic energy is 9J.
b) what is the toy's potential energy ? The toy's potential energy is 29.43J.
c) what is the toy's mechanical energy ? The toy's mechanical energy s 38.43J.