Khufra works at a spring factory and he was assigned to test a certain spring, whose constant is 50 N/m, attached to a 30-kg block in an incline (0=30°). With the spring initially at equilibrium position, the block was pulled 0.5 meters down the incline by a 50-N external force applied parallel to the path. If the coefficient of kinetic friction is 0.5, determine the a) normal force (in Newtons) b) work done by the spring (in Joules)

Khufra works at a spring factory and he was assigned to test a certain spring, whose constant is 50 N/m, attached to a 30-kg block in an incline (0=30°). With the spring initially at equilibrium position, the block was pulled 0.5 meters down the incline by a 50-N external force applied parallel to the path. If the coefficient of kinetic friction is 0.5, determine the a) normal force (in Newtons) b) work done by the spring (in Joules)