A child suspends a steel disc in a vertical plane by means of a thread.Then he shoots bullets on the disc by a toy gun.If mass of each bullet be 2g and the bullet striking the disc with a velocity of 11 m/s is returning with same velocity then what average force is being exerted on disc?The child is firing 3 bullets per second.

Dear Student!!

Initial velocity of the bullet, u = 11 m/s

Final velocity of the bullet, v = -11 m/s

mass ot the bullet ,m = 2 g

mass of the bullet per  sec, m'

t = 1sec

average force exerted on the disc = ( m'v - m'u )/t


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