a 4 g bullet traveling horizontally with a velocity of magnitude 400 m/s, is fired into a wooden block with mass 0.800kg

[answerhappygod]

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?