A bullet of mass 0.04 kg moving with a speed of `90 ms^(-1)` enters a heavy wooden block and is stooped after a distance of 60 cm . What is the average resistive force exerted by the block on the bullet ?

Explanation

The retardation 'a' of the bullet (assumed constant ) is given by
a = `-u^(2)` / 2s = `-90 xx 90 / 2 xx 0.6 ``ms^(-2)` = `-6750 ms^(-2)`