This question has been perfectly handled. But I still have a challenge, am failing to identify the error am making in my solution. Have a look at what I did Wnet = Wapplied force — Wfriction 150 = 1050 –Ff Ff = 1050–150 = 900. To find Uk , Uk = Normal force/Friction force. We know in this case that our normal force is equal to weight = mg = 50 kg x 9.8 = 490N. Coefficient of friction will therefore be equal to 490N /900 = 0.54 kindly help me erase this off my thinking