Question

If a car is moving on a highway at 70 km/hr, going South and then turns to travel 70 km/hr East. What happens to the cars speed and velocity?
(A)Speed - changing, Velocity - constant


(B)Speed - constant, Velocity - changing


(C)Speed - constant, Velocity - constant


(D)Speed - changing, Velocity - changing

Answer 1

Answer:

(B)Speed - constant, Velocity - changing

Explanation:

The magnitude of the velocity ( speed ) has not changed as car is traveling constantly at 70 km/h. But we know the velocity is also having a direction component, and the car which was traveling South is now traveling East. As direction is changed, velocity is changed but as magnitude of velocity has not changed, the speed remain unchanged.