1. A. gun was fired so that its bullet moves at 10 m/s. if the bullet
and gun's masses are 50 grams and 500 grams respectively,
what velocity will the gun recoil upon firing?
2. A 6 kg toy car travelling 20 m/s collides heads on with a 4 kg
toy car travelling at 8 m/s. Determine the velocity after collision
of the first car, if the second car moves to the right with a final
velocity of 20 m/s. Assume that the collision occurs in an
isolated system,​