A coin sitting on a counter has 0.05 J of potential energy (PE). It falls off the counter and straight down to the floor.

Which physical law is obeyed when the PE of the ball at the instant the ball begins to fall and the KE of the ball at the end of the fall are equal?

A.
the law of conservation of energy

B.
the law of equal energy

C.
the law of universal gravitation

D.
the law of conservation of matter

Question

A coin sitting on a counter has 0.05 J of potential energy (PE). It falls off the counter and straight down to the floor. 
 
Which physical law is obeyed when the PE of the ball at the instant the ball begins to fall and the KE of the ball at the end of the fall are equal?
 
 A.
the law of conservation of energy
 
 B.
the law of equal energy
 
 C.
the law of universal gravitation
 
 D.
the law of conservation of matter

anonymous · Answer

A