A bob hangs from a string over a pulley inside a car accelerating horizontally with acceleration a. A person in the car pulls the other end of the string downward with acceleration a relative to the car. The string tension is:

Question

G1 Physics · Accepted Answer

Resolve the bob in the accelerating car frame and include the imposed acceleration of the pulled string end. The source result is m√(g²+a²)+ma. Option C.