Velocity and Acceleration

  • Thread starter cheerspens
  • Start date
  • #1
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Homework Statement


a) A 3100 kg car can accelerate with a maximum acceleration of 3.0 m/s2.
How long will it take this car to go from a velocity of 20 m/s to 40 m/s?

b) If there is a 4000 N force do to air friction opposing the car's motion, what is the strength of the force responsible for the car's acceleration?

c) What object exerts the force that accelerates the car?

Homework Equations


FNET=ma
x=xo+vot+.5at2
v=vo+at


The Attempt at a Solution


a) I got an answer of 6.67sec.

b) I got an answer of 9700 N.

c) The tires? Because of friction?
 
Last edited:

Answers and Replies

  • #2
rock.freak667
Homework Helper
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What causes the car to move in the first place is what I think they are asking for part c.
 
  • #3
92
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The road?
 
  • #4
rock.freak667
Homework Helper
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31
The road?

Or it could be the engine causing the tires to rotate.
 

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