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Relative Velocity

A car is goin...

Question

A car is going towards North with a velocity 20m/s.after some time it starts to go towards south with velocity 20m/s Determine change in velocity of the car

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Solution

Velocity is a vector quantity so when it goes north v1=+20m/s
southv2=-20m/s

when we find change in velocity
=v2-v1
-20-20=-40m/s

or v1-v2
=20-(-20)
40m/s

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