A 1200kg travelling east collides with another 1000kg car travelling north. If they are both travelling at 90km/h and the collision is completely inelastic, find the velocity of the systemafter collision.

Answer 1

the final mass is 2200 Kg if it is totally inelastic and they stick to each other.

east momentum
1200 * 90 = 2200 Ve

north momentum
1000 * 90 = 2200 Vn

|V| = sqrt (Ve^2+Vn^2)

tan compass angle east of north = Ve/Vn