In magn 1. Displacement vectors of 3 m and 5 m in the same direction combine to make a displacement vector that is
O 8 meters
O 15 meters
O 2 meters
O 4 meters

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.