1) A 15 kg mass moving in the positive x-direction at 9 m's collides with a 20 kg mass moving at 4 m/s. Sketch: a) If the speed of the 15 kg mass after the collision is -2m/s, what is the speed and direction of the 20 kg mass?​

The rocket is fired vertically and tracked by the radar station shown. when θ reaches 66°, other corresponding measurements give the values r = 32700 ft, r¨ = 85 ft/sec2, and θ˙ = 0.019 rad/sec. calculate the magnitudes of the velocity and acceleration of the rocket at this position.