Answer :
Given that a boy spins a top on a table.
Let's determine how he can decrease the total energy of this system.
The total energy of the system can be said to be the total kinetic and potential energy.
In order to decrease the total energy, the boy needs to spin the top more slowly.
He needs to reduce the spinning speed.
Therefore, he can decrease the total energy of this system by spinning the top more slowly.
ANSWER:
D. Spin the top more slowly