Position of particle as a function of time is given as `vec r=cos wt hati+sin wt hatj` . Choose correct statement about `vecr,vec v` and `vec a` where `vec v` and `vec a` are velocity and acceleration of particle at time t.

Options

A. `vec v ` is perpendicular to `vec r` and `vec a` is towards origin
B. `vec v` and `vec a` are perpendicular to `vec r`
C. `vec v` is parallel to `vec r` and `vec a` parallel to `vec r`
D. `vec v` is perpendicular to `vec r` and `vec a` is away from origin

Answer

A

Explanation

NA