A man is sitting on a 20 m height building and his mass is 50 kg. Calculate the mechanical energy.

9810 Joules

Explanation:

Given parameters are,

m = 50 kg

h = 20m

the man is not moving, therefore, K. E = 0

The formula of mechanical energy

M. E = 1/2 mv2 + mgh

Since K. E is 0, the equation becomes,

M. E = mgh

M. E = 50 * 9.81 * 20

M. E = 9810 J

Hence the mechanical energy is 9810 Joules