A bullet of mass 10g moving horizontally with speed 400m s−1 penetrates and remains embedded in a stationary wooden block of mass 2kg placed on a smooth horizontal surface.
a. (i) Calculate the common velocity of the bullet–block system just after the impact.
b. (ii) Determine the loss of kinetic energy of the system in joules.
c. (iii) Express this loss as a percentage of the bullet’s initial kinetic energy.