a bullet of mass 10.0g sprites a wall with a velocity of 500m/s ,determine the work done by the wall on the bullet which penetrate 0.10m .

Answer 1

V^2 = Vo^2 + 2a*d = 0.
500^2 + 2a*0.1 = 0,
a = -1,25*10^6 m/s^2.

F = M*a = 1*10^-2 * 1.25*10^6 = -1.25*10^4 = -12,500 N.
Work = F*d = 12,500 * 0.1 = -1250 Joules.

Note: The negative sign means that the force opposes the bullet motion.