A body weighing 2 kg, located at a height of 3 meters, has a total mechanical energy equal to 80 joules.
| November 16, 2020 | education
A body weighing 2 kg, located at a height of 3 meters, has a total mechanical energy equal to 80 joules. What is the kinetic energy of the body at this height?
Given:
m = 2 kg
h = 3 m
E total = 80 J
To find:
Ekin
Decision:
Epoln = Ekin + Epot
Ekin = Epoln – Epot
Epot = mgh
Ekin = Epoln – mgh
Ekin = 80 – 2 * 3 * 10 = 80 – 60 = 20 J
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