Question

A blue-ball of mas m=3 kg is thrown with an initial speed ?0 m/s, at an angle of θ=32.4° above the horizontal. At the same time, a black-ball of mass m=2 kg is dropped from rest. When blue-ball starts the projectile motion, the black-ball is 19.62 m above the ground and starts the free-fall. After 1.3 s later, these two balls stick together after colliding in the air (no air resistance), in the case of perfectly inelastic collision.

a) Find the momentum vector after perfectly inelastic collision. 

2021-01-10.png

b) When and where do they hit the ground after perfectly inelastic collision?