A 28 kg block on a horizontal surface is attached to ahorizontal spring of spring constant k = 2.9 kN/m. The block ispulled to the right so that the spring is stretched 8.4 cm beyondits relaxed length, and the block is then released from rest. Thefrictional force between the sliding block and the surface has amagnitude of 37 N. (a) What is the kinetic energy of the block whenit has moved 2.7 cm from its point of release? (b) What is thekinetic energy of the block when it first slides back through thepoint at which the spring is relaxed? (c) What is the maximumkinetic energy attained by the block as it slides from its point ofrelease to the point at which the spring is relaxed?
