Please explain all steps

5) You push a 20 kg box 10 meters. The coefficient of kinetic friction between the box and the floor is #x = 0.5. How much work did you do? a) 10 Joules b) 20 Joules c) 50 Joules d) 100 Joules 6) Prior to getting the box moving in the previous problem, you need to push it with sufficient force to overcome the force of static friction, #, = 0.8. Immediately after the box is unstuck, how much work have you done? "Immediately" here means a time interval that is immeasurably small. a) 0 Joules b) 16 Joules c) 25 Joules d) 160 Joules