## anonymous one year ago What is the average acceleration of a jet ski that goes from rest to 10 m/s west in 4 s? Take the direction west to be positive, and east to be negative. A. 2.5 m/s2 B. -2.5 m/s2 C. 0.4 m/s2 D. -0.4 m/s2

1. taramgrant0543664

Acceleration is just the change in velocity divided by the change in time so you just have to take the 10m/s divided by 4s Since west is positive and the jet ski is going west your answer will be positive.

2. anonymous

A?

3. taramgrant0543664

Yes it would be A

4. anonymous

sweet if you help me with one more i'll give you a metal

5. anonymous

Which of the following has no acceleration? A. a satellite orbiting at a constant speed B. a person running once around a track at a constant speed C. a car making a turn at a constant speed D. a person running 100 m straight across a field at a constant speed

6. anonymous

brb

7. anonymous

@taramgrant0543664 ?

8. taramgrant0543664

It would be D because acceleration exists for the rest because there was a change in direction but not in this case it was a straight run

9. Astrophysics

Think of acceleration as $\frac{ \Delta v }{ \Delta t }$ so the change in velocity over time

10. Astrophysics

Yes, D is right, as your speed is at constant a = 0

11. Astrophysics

As tara mentioned, there is no change in direction and if you think of velocity, which is $\frac{ \Delta d }{ \Delta t }$