2-10.
A bullet strikes a resting wooden block at a horizontal speed 
and exits the block at
speed 
. and
are measured and
treated as independent random variables due to the measurement uncertainty and follow
normal distributions 
and 
. The mass of the bullet and the wooden block are 
and 
, respectively. How long will the block slide on the floor,
after the bullet emerges, before it comes to rest again? The coefficient of
kinetic friction between the block and floor is 
.
Solution: 
