The kinetic energy (KE) of a ball the moment it hits the ground when dropped from a height above the ground is exactly equal to the potential energy (PE) of the ball when it was released.

Which is true about this closed physical system?

a. It obeys the second law of thermodynamics.
b. It obeys the first law of thermodynamics.
c. It obeys the law of conservation of energy.

Question

The kinetic energy (KE) of a ball the moment it hits the ground when dropped from a height above the ground is exactly equal to the potential energy (PE) of the ball when it was released. 

 

Which is true about this closed physical system?

a. It obeys the second law of thermodynamics.
b. It obeys the first law of thermodynamics. 
c. It obeys the law of conservation of energy.

michele_laino · Answer

Hint:
If we have the equation:
KE=PE, then energy is conserved, since we have this situation:
|dw:1432943992297:dw|
so the sum:
KE + PE = mgh, at both positions

shamim · Answer

Anyway thermodynamics deals with heat

shamim · Answer

Total energy is always equal is called conservation of energy

shamim · Answer

Total energy=k.E+p.E

anonymous · Answer

thanks for the help!!

shamim · Answer

Welcome!!