Physic <span title="C.........emergency!!!!!!!!!!?">C.........emergency!!!!!!...</span>

Question

A 1400 kg cannon, which fires a 70 kg shell with muzzle speed 566 m/s, is set to fire at an angle of 39.0 degree above the ground. The cannon is mounted on frictionless rails, so that it recoils freely.

a) What is the Speed of shell with respect to earth?

b) At what Angle with the ground is the shell projected?

Answer 1

v0=556m/s

a) v0 cos(39)

b)

a = 39, m =70, M = 1400

m v0 cos a = mv0 cos b + Mv cos b

unknowns: v and b