Answer:
option B
85 J
Explanation:
Given in the question,
mass of the dog = 7.2 kg
height it want to achieve = 1.2m
Formula to use
gravitational energy at maximum height = kinetic energy on the ground level
gravitational energy = mgh
here m = mass
g = acceleration due to gravity = 9.8 m/s²
h = height
plug values in the formula
7.2(9.8)(1.2)
84.672 J
≈ 85 J
