A Car Rounds a 75-M Radius Curve at a Constant

Multiple Choice

A car rounds a 75-m radius curve at a constant speed of 18 m/s. A ball is suspended by a string from the ceiling the car and moves with the car. The angle between the string and the verticle is:

A) 0
B) 1.4°
C) 24°
D) 90°
E) cannot be found without knnowing the mass of the ball