Answer:
First let's find the work.
Work = Force*Displacement
= 20*5
= 100 Joules
Power = Work/Time
= 100/4
= 25 Watts
I believe the answer is energy
This law states that, despite chemical reactions or physical transformations, mass is conserved — that is, it cannot be created or destroyed — within an isolated system
Ice at -25
Hope this helps
May God bless you and your family
Michelaneglo DDDDDDDDDDDDDDDDDDDDDDDDD