Question

A motor car is going due north at a speed of 50 km/h .It makes a 90° left tern without changing the speed . The change in the velocity of the car is about

Answer 1

See picture enclosed.

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.