anonymous
  • anonymous
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
Mathematics
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anonymous
  • anonymous
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
Mathematics
katieb
  • katieb
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taramgrant0543664
  • 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
  • anonymous
A?
taramgrant0543664
  • taramgrant0543664
Yes it would be A

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anonymous
  • anonymous
sweet if you help me with one more i'll give you a metal
anonymous
  • 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
  • anonymous
brb
anonymous
  • 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
  • Astrophysics
Think of acceleration as \[\frac{ \Delta v }{ \Delta t }\] so the change in velocity over time
Astrophysics
  • Astrophysics
Yes, D is right, as your speed is at constant a = 0
Astrophysics
  • 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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