[填空题]
A 25-g bullet strikes and beco4l :q7 u maidlbang)6fyk+c/lu f 5k9:metl5l mku / 6j 7fhlb3c5l)iv/ts embedded in a 1.35-kg block of wood placed on a horizontal surface just in front of the gun. If the coefficient of kinetic friction between the block and l5t v/k/i3tjfmublcl)h5 67lthe surface is 0.25, and the impact drives the block a distance of 9.5 m before it comes to rest, what was the muzzle speed of the bullet? m/s
