Question

A car moves on a circular path of radius 5m. At one instant the speed of car is 5 m/s and it is decreasing at rate of 5 m/s^2. The angle between acceleration vector and velocity vector at this instant is
(A) pie/3 (B) pie/6
(c) pie /4 (D) 3 pie /4 ​

Answer 1

Answer:

Radians measure angles by distance traveled. or angle in radians (theta) is arc length (s) divided by radius (r). A circle has 360 degrees or 2pi radians— going all the way around is 2 * pi * r / r. So a radian is about 360 /(2 * pi) or 57.3 degrees.