Question

2. An 800-g bird has 47.0 J of gravitational potential
energy when it is perched high up in a tree.
Calculate the bird's vertical height from the ground.

Answer 1

Ep = mgh = 47.0 J

m = 0.8 kg
g = 9.81 m/s2 (average)

h = Ep / mg = 47 J / 0.8 kg * 9.81 m/s2 = 5.989 m