A cinder block is sitting on a platform

Question

A cinder block is sitting on a platform 20 m high. It weighs 79 kg. The block has what type of energy AND which equation would you use to calculate it?
(A)Kinetic Energy Equation: KE= 1/2mv²
(B)Potential Energy Equation: PE = 1/2mv²
(C)Potential Energy Equation: PE = mgh
(D)Kinetic Energy Equation: KE = mgh

Kunduz · Accepted Answer

A correct answer is an option (C).
First, we need to find what type of energy is P.
As the cylinder block is high up in the air and is not moving, it will have potential energy.
The equation of potential energy is Ep = m*g*h.
where Ep is potential energy,
m = mass of the object,
g = 9.8m/s,
w = 79N,
H = 20m
As w = mg
Hence we can substitute mg into the potential energy equation.
 Ep = m*g*h= w*h
Therefore, Ep = 79N*20m
                      = 1580Nm = 1580J

A cinder block is sitting on a platform 20 m high. It weighs 79 kg. The block has what type of energy AND which equation would you use to calculate it? (A)Kinetic Energy Equation: KE= 1/2mv² (B)Potent