In the figure below, the net external force on the 30 kg mower is stated to be 60 N.

Part a.If the force of friction opposing the motion is 20 N, what force F (in N) is the person exerting on the mower? (Enter the magnitude.)

Part b. Suppose the mower is moving at 1.5 m/s when the force F is removed. How far (in m) will the mower go before stopping?