In the figure there is a long horizontal bridge over a river 75 m high from water surface. A strong man throws a stone in the parallel plane of the bridge. A observer in a car travelling on the bridge finds the stone going pass by the car while ascending and also while descending between two points on the road 30 m away. The car is travelling at a speed of 15 m/s. The stone is thrown from the bank of river just at the same level of water.

What is the angle the velocity makes with the bridge when it goes past the car while ascending ?

Options

A. `30^(@)`
B. `45^(@)`
C. `tan^(-1) (2/3)`
D. `tan^(-1) (3/2)`

Answer

C