Is change is speed same as change in velocity?

Question

Is change in speed same as change in velocity?

There's a question regarding a rebounding ball and the question wants in change in speed and change in velocity before/after rebound.

I know ∆v = v(final) - v(initial)

How bout change in speed? (we're given 2 values in m/s)

Thanks for any help!

Answer 1

no

Answer 2

It's perhaps looking for similiar answers:

Velocity gives a magnitude AND a direction; it is a Vector quantity

Speed gives only the magnitude; it is a Scalar quantity.

So simply give the same answer for speed except for velocity add the direction of the ball

Answer 3

Speed is a scalar quantity

velocity is a vector quantity with magnitude and direction

They are different and not the same

Answer 4

no they are different.

the change in speed is a magnitude only. in other words the speed going into the wall minus the speed coming off the wall.

with velocity it is a vector quantity meaning it has magnitude and direction. for example.

a ball going towards a wall at 5m/s hits the wall and bounces back at 3m/s. chang in speed is  5 - 3 = 2 m/s

change in velocity is +5 - (-3) = 8m/s towards the wall. you must also state that speed to the wall is positive and away is negative.

Answer 5

The change in velocity would have to take into account the fact that the ball is bouncing (velocity is speed and direction) the speed would just be the difference of the two values.

Answer 6

No, speed is how fast something travels, velocity is that rate at which something changes position, eg, how far its come from the origin and how fast it did so.