Question

A motor car is going due North at speed of 50 km/h. It makes a 90° left turn without changing its speed, the change in velocity of the car is

Answer 1

Car travel from A to B and then B to C.  Initial velocity is AB and Final velocity is BC.  The following are vectors.

 Change in velocity = BC -AB  = BC + BA = BD

  Magnitude of BD  =  √(V²+V²) = √2 V = √2 * 50 = 70.7 kmph

  The direction of the change in velocity is direction of BD, 45° south of West or South west.