Starting from a stationary position , Rahul paddles his bicycle to attain a velocity of `6 m//s` in `30 s`. Then he applies brakes such that the velocity of bicycle comes down to `4m//s` in the next `5s` . Calculate the acceleration of the bicycle in both the cases.

Options

A. `-4.4 m//s^2,0.2 m//s^2`
B. `0.4 m//s^2,0`
C. `0,0.2 m//s^2`
D. `0.2 m//s^2,-0.4 m//s^2`

Answer

D