A man squatting on the ground gets straight up and stand. The force of reaction of ground on the man during the process is.

Options

A. constant and equal to mg in magnitude
B. constant and greater than mg in magnitude.
C. variable but always greater then mg
D. at first greater than mg and later becomes equal to mg

Answer

D

Explanation

In squatting, he is tilted some what, hence also has to balance frictional force besides his weight in this case R= friction + mg `implies Rgtmg`
When he set straight in that case,
R=mg