a 4 g bullet traveling horizontally with a velocity of magnitude 400 m/s, is fired into a wooden block with mass 0.800kg, initially at rest on a level surface. the bullet passes through the block and emerges with its speed reduced to 190m/s. the block slides a distance of 72.0cm along the surface from its initial position.

-calculate: is the coefficient of kinetic friction between block and surface?

-calculate the decrease in kinetic energy of the bullet?

- calculate the kinetic energy of the block at the instant after the bullet passes through it?