Finding Acceleration

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



A motorist enters a freeway at 45km/h and accelerates uniformly to 99 km/h. From the odometer of the car, the driver knows she has travelled 0.2km. Find the acceleration of the car.

Homework Equations





The Attempt at a Solution



I attempted this:

v2 = u2 + 2as

Substituting the values in I got this:
(992 -452)/0.4 = a

this gives 19440, so converting to m/sec I think I get 5400 m/sec2

This is definitely not right, any ideas why?

Cheers,
Adrian :)

Homework Statement





Homework Equations





The Attempt at a Solution

 

Answers and Replies

  • #2
Doc Al
Mentor
45,412
1,850
this gives 19440, so converting to m/sec I think I get 5400 m/sec2
What units do you think the 19440 would be in? Check your conversion.

The best thing to do is change units to m/s and m before you use them in the formula.
 
  • #3
adoado
72
0
Got it! Thanks a bunch!

Cheers,
Adrian
 

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