Question

A dog of mass 4 kg runs up a hill of height 8 m. How much gravitational potential energy does the dog gain?

A.314 J
B.229 J
C.32 J
D.78 J

Answer 1

A. 314 because when you use the formula for the GPE ; GPE=MGH or means mass times gravity time height (4x8x9.8) and thats equivalent to 313.6 which rounds up to 314. Hope it helps 

Answer 2

The gravitational potential energy is 314 J.

(A) is correct option.

Explanation:

Given that,

Mass of dog = 4 kg

Height = 8 m

We need to calculate the potential energy

Using formula of potential energy

`P.E = mgh`

m = mass

g = acceleration due to gravity

h = height

Put the value into the formula

`P.E=4*9.8*8`

`P.E=313.6=314\ J`

Hence, The gravitational potential energy is 314 J.