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

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- 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.

- anonymous

A?

- taramgrant0543664

Yes it would be A

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## More answers

- anonymous

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

- 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

- anonymous

brb

- anonymous

@taramgrant0543664 ?

- 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

- Astrophysics

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

- Astrophysics

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

- Astrophysics

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

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