A car is travelling around a circular track at a steady speed. A force causes it to follow the track. What is the angle between this force and the car's velocity? Draw a diagram to illustrate your answer.

Ahot-air balloonist, rising vertically with a constant speed of 5.00 m/s releases a sandbag at the instant the balloon is 40.0 m above the ground. after it is released, the sandbag encounters no appreciable air drag. compute the velocity of the sandbag at 0.250 s after its release.