A is the answer, I think.
1/2 = 2m
2m/2 = 1/2 divided by 2
1/2 * 1/2 = 1/4
m = 1/4
m = 0.25
Answer: m = 1/4 or 0.25
490J
Step-by-step explanation:
Given parameters:
Mass of rock = 5kg
Height of hill = 10m
Unknown:
Potential energy at the hilltop = ?
Solution:
Potential energy is the energy at rest of a body. it is given as:
P.E = mgh
m is the mass of the body
g is the acceleration due to gravity = 9.8m/s²
h is the height of the hilltop
P.E = 5 x 10 x 9.8 = 490J
Learn more:
Potential energy brainly.com/question/10770261
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