Question

Which is a valid velocity reading for an object? 45 m/s 45 m/s north 0 m/s south 0 m/s

Answer 1

Answer:

Option 2

Explanation:

Velocity is defined by the of displacement, or the displacement in a given time.

Velocity is an vector quantity, which means it not only tells about the magnitude, it tells about the direction as well.

Suppose of an body travelling on a straight path at a speed of x km / hr in North. Then velocity will be defined by x km / hr North.

And, magnitude of velocity defines the speed of the body.

Here,

first option is 45 m / s

Although this tells the speed, but there is no description for the direction, so it's not a vector reading.

third & fourth option are same as this one. { 0 is a null vector, shows that body has returned to the same point and thus can't actually define the direction }

Whereas, second option 45 m / s North tells about the speed as well as its direction.

Therefore,

45 m / s North is a valid vector reading for an object.

Answer 2

Answer: B

Explanation: Edge 2021