A bullet of mass 25g travelling at 300ms−1 embeds itself in a stationary wooden block of mass 2.0kg resting on a horizontal surface with uniform coefficient of kinetic friction μk. After the impact, the block together with the bullet slides 0.90m before coming to rest. Take g=9.8ms−2.
a. (i) Find the speed of the block–bullet system just after impact.
b. (ii) Determine the coefficient of kinetic friction between the block and the surface.