Hello

I need to solve for the muzzle velocity, maximum height, and range of the potato cannon launcher. All the preexisting values I know is that it is launched at a 45-degree angle, and it took 10 seconds to land on the ground. We assume that we launched at the height of 0m.

My friend told me the answer for each one by using basic kinematics and other basic physics equasions

he says muzzle velocity is 69.34m/s

maximum height is 122.6m

range is 490m.

I am not sure how he got this answer. But it is right since it matched to the projectile motion calculator online.

Please kindly let me know if you know what to do to find the answers to this question.