Entlar energy . A light horizontal spring has a spring constant of 155 N/m. A 1.50 kg block is compressed against
the spring. After the block is released, it travels a distance of 0.85 m across a surface before coming
to rest. If the coefficient of kinetic friction between the block and the surface is 0.20, calculate how
far the spring was compressed.
a. 0.03 m
c. 0.23 m
b. 0.18 m
d. 0.28 m

The great sandini is a 60.0-kg circus performer who is shot from a cannon (actually a spring gun). you don’t find many men of his caliber, so you him design a new gun. this new gun has a very large spring with a very small mass and a force constant of 1100 n/m that he will compress with a force of 4400 n. the inside of the gun barrel is coated with teflon, so the average friction force will be only 40.0 n during the 4.00 m he moves in the barrel. at what speed will he emerge from the end of the barrel, 2.50 m above his initial rest position?