A body has an initial velocity of `3m//s` and has an acceleration of `1m//sec^(2)` normal to the direction of the initial velocity. Then its velocity 4 seconds after the start is

Options

A. `7m//sec` along the direction of initial velocity
B. `7m//sec` along the normal to the direction of initial velocity
C. `7m//sec` mid-way between the two directions
D. `5m//sec` at an angle of `tan^(-1)(4//3)` with the direction of initial velocity.

Answer

D