Help with Kinematics equation problem

Physics
Tutor: None Selected Time limit: 1 Day

A VW Beetle goes from 0 to 64.4 mi/h with an acceleration of +2.32 m/s2.

(a) How much time does it take for the Beetle to reach this speed? 

____ s

(b) A top-fuel dragster can go from 0 to 60.0 mi/h in 0.600 s. Find the acceleration of the dragster. 

____ m/s2


Aug 26th, 2015

Thank you for the opportunity to help you with your question!


v = v0 + at


Where:
v0 = initial velocity
v = final velocity
a = acceleration
t = time

64.4 =0 + 2.32 (t)

convert miles per hour to m/s gives 28.7894

28.7894=2.32t

t=28.7894/2.32

t= 12.40922 s


b. 0 to 60.0 mi/h in 0.600 s

find acceleration

a = (v - v0)/t

Where:
v0 = initial velocity
v = final velocity
a = acceleration
t = time

a=60/0.6

a = 100 m/s2





Please let me know if you need any clarification. I'm always happy to answer your questions.
Aug 26th, 2015

Thank you for taking the time to answer my question! For the second question on the dragster, how did you get the 100m/s^2. I did the same conversion you did for part a by turning mi/h to m/s^2 and got 26.8. I divided by .6 and got 44.7m/s^2. Did I do something wrong?

Aug 26th, 2015

Oh no, I did it wrong myself, I did  not convert to meters. Sorry and thanks for the insight.

Aug 26th, 2015

Ah, phew. Thank you for clearing things up! I get the concept now. Thanks a lot!

Aug 26th, 2015

You are welcome.

Aug 26th, 2015

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Aug 26th, 2015
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Aug 26th, 2015
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