A boy rides a sled down a steep, snow. covered hill. Which of the following takes place during the child's ride?
a
Potential energy decreases and kinetic energy
increases.
Need a Hint?
b
Potential energy increases and kinetic energy
decreases
c Both kinetic and potential energy increase.

a. Potential energy decreases and Kinetic energy increases

Explanation:

Because as he comes down due to its steepness the speed of the boy or you can say his KE increases and since he comes from a high position (hill) to the lower ground his potential energy decreases simultaneously

atomic = no of protons.

mass number-atomic number = neutron number

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask