The raindrops are hitting the back of a man walking at a speed of `5km//hr`. If he now starts running in the same direction with a constant acceleration, the magnitude of the velocity of the rain with respect to him will

Options

A. gradually increase
B. gradually decrease
C. first decrease then increase
D. first increase

Answer

B

Explanation

`omega^(2)R = R(d omega)/(dt), omega = (d theta)/(dt) = (omega_(0))/(1-omega_(0)t) implies T = (R )/(v_(0)) (1-e^(-pi))`