Please help with 11b

1 1. A man pushes a 45 kg box from rest along a horizontal floor by exerting a force of 87 N downward at 33 to the horizontal against a friction force of 62 N over a distance of 13 m. a) How much work was done in moving the box? M= 45(9. 8) W= Fd = 4141 87 N Fopp= 87N W = 73 (13) 93 N Ffr = 62 N = 9495 33 F 1 d = 13 m 4 FI 62 N Fil 73 N a ) 949 5 3 marks 441 N b) Determine the change in kinetic energy while the box was pushed. b) 2 marks c) What was the final speed of the box after 13 m