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

Given, Initial Velocity v1 = 50 km/hr.

           Final Velocity v2 = 50km.hr.

           theta = 90 degrees

We know that Change in magnitude  = (v2^2 + v1^2 - 2 v1 v2 cos 90)^1/2

                                                              = (50^2 + 50^2)^1/2

                                                               = 70.7  km/hr.

Change in velocity = 70.7 km/hr.


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