The 50-lb package starts from rest, slides down the ramp, and is stopped by the spring. Th...

The 50-lb package starts from rest, slides down the ramp, and is stopped by the spring. The coefficient of kinetic friction between the package and the ramp is μk= 0.12. If you want the package to be brought to rest 6 in from the point of contact, what is the necessary spring constant k?