Question

A car has a velocity →v=80km/hr towards east. Another car on the road has a velocity = →−v. The magnitude and direction of velocity of second car is

A
80 km/hr towards south
B
80 km/hr towards west
C
Direction cannot be determined from the given information
D
Speed of the second car cannot be determined from the given information.

Solution

The correct option is B 80 km/hr towards west We know that negative of a vector has the same magnitude but the opposite direction. So the second car having velocity →−v will have same speed (magnitude) as that of first car which is 80 km/hr, but the direction will be opposite. So the direction of the second car will be towards west, opposite to that of first car.

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