- #1
Sirsh
- 267
- 10
A tennis ball of mass 10.0 g bounces vertically on a concrete floor. The ball strikes the floor at 20.0 m s–1 and rebounds at 15.00 m s–1.
5.
A. What is the change in speed of the ball as it bounces?
Δv = v1-v2
= 20ms-1 - 15ms-1
Δv = 5ms-1
B. What is the change in velocity of the ball as it bounces?
Δv = v1 - v2
= 20ms-1 – (-15ms-1)
Δv = 35ms-1
Does that depict the difference between speed and velocity as speed is a scalar quantity it doesn't have direction therefore when calculating (in this case) is a positive value, but when calculating the change in velocity because it is a vector quanitiy it has a direction ( negative because it's going in the opposite direction as the initial drop) so it has a negative value? I am not sure if this is correct. thank you.
5.
A. What is the change in speed of the ball as it bounces?
Δv = v1-v2
= 20ms-1 - 15ms-1
Δv = 5ms-1
B. What is the change in velocity of the ball as it bounces?
Δv = v1 - v2
= 20ms-1 – (-15ms-1)
Δv = 35ms-1
Does that depict the difference between speed and velocity as speed is a scalar quantity it doesn't have direction therefore when calculating (in this case) is a positive value, but when calculating the change in velocity because it is a vector quanitiy it has a direction ( negative because it's going in the opposite direction as the initial drop) so it has a negative value? I am not sure if this is correct. thank you.