question_answer

A body is moving with uniform speed v in a horizontal circle in anticlockwise direction as shown in figure. The motion starts from point A, find the change in velocity in second quarter of revolution.

A) \[\sqrt{2}vN-W\]                     

B) \[0.64m/s\]

C) \[0.5m/s\]                    

D) \[1.2m/s\]

Correct Answer: D

Solution :

The diagram is clearly showing the change in velocity vector:\[\Delta \overrightarrow{v}={{\overrightarrow{v}}_{2}}-{{\overrightarrow{v}}_{1}}\]