Question

A 87 kg man has a total mechanical energy of 1780 J .If he is swinging downward and is currently 1.4 m above the ground, what is his speed? Use g = 10 m/s^2

Answer 1

6.4m/s

Step-by-step explanation:

The total mechanical energy of the man is 1780J.

This mechanical energy is the energy due to the motion of the body and it is a form of kinetic energy.

Also, mass = 87kg

Kinetic energy =
`(1)/(2)` m v²

m is the mass

v is the velocity

1780 =
`(1)/(2)` x 87 x v²

v² = 40.9

v = 6.4m/s