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What is the speed of the shell with respect to the Earth?

Vse=Vsm+Vme, Vme=Vse-Vsm, Vsm= 566m/s

MVi= 0 = 55kg(Vse)+1250kg(Vse-566m/s)

so, Vse=542m/s and Vme = 542m/s-566m/s = -24m/s

I have solved the first part by using the conservation of momentum.

However, I have some diffculty on the second part.

At what angle with the ground is the shell projected?

This angle of the shell relative to the ground can be given by the ratio

calculation however im not so sure.

Can anyone please solve and show me how to solve the second part?