Solve the given question:

Question: The Zacchini family was renowned for their human cannonball act in which a family member was shot from a cannon using either elastic bands or compressed air. In one version of the act, Emanuel Zacchini was shot over three Ferris wheels to land in a net at the same height as the open end of the cannon and at a range of 68 m. He was propelled inside the barrel for 5.7 m and launched at an angle of 50°. If his mass was 81 kg and he underwent constant acceleration inside the barrel,

Part A: What was the magnitude of the force propelling him?

I need help to find the magnitude of the force propelling him and treat the launch as though it were along a ramp at 50°. Neglect air drag.