Kristina demonstrates a toy for her younger brother. The steps to operate the toy are listed below.Step 1. Push the toy down.Step 2. A spring compresses.Step 3. Release the toy.Step 4. The toy jumps into the air.
Answer
A
Elastic potential energy changes to gravitational potential energy.
B
Gravitational potential energy changes to elastic potential energy.
C
Kristina does work to increase the gravitational potential energy.
D
Kristina does work to increase the elastic potential energy.