Question 155 of 172


                                                                                                      

A particle moves so that its position vector is given by r=cosωt ^x+sinωt ^y where w is a constant.      Which of the following is true?

(a) Velocity and acceleration both are parallel to r.

(b) Velocity is perpendicular to r and acceleration is directed towards to origin

(c) Velocity is perpendicular not and acceleration is directed away from the origin

(d) Velocity and acceleration both are perpendicular to r.