A body moving with speed of 30km/hr towards east turns sharply towards north at 40 km/hr , the magnitude of change of velocity is
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A car is moving towards the north with a velocity 20m/sec. After some time it starts to go towards the south with a velocity 20 m/sec. What is the change in the velocity of the car?
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The change in velocit of the car is = 40 m/sec
Welcome to the Vector mechanics, Velocity is a vector quantity which depends both on magnitude and the direction.
In the above scenario, the magnitude remained the same but the direction changed by 180 degrees...
v1 = 20 m/sec
v2 = 20m/sec cos a(angle between the two vectors) = -20
dv = v2-v1
= (-20) - (20)
= -40 m/sec
The negative sign indicates that the car is moving in the opposite direction relative to the initial direction
- BRO ITS NOT BODY IT IS CAR
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