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Old Jan 31st 2010, 12:12 PM   #1
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what distance does this car require to stop when it s travelling twice as fast?

a car travelling 30 m/s is able to stop in a distance d. Assuming the same braking force, what distance does this car require to stop when it s travelling twice as fast?

i'm lost..hope u guys can help me
alessandro is offline   Reply With Quote
Old Feb 1st 2010, 02:44 AM   #2
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Hi

use equation of motion as 2*acceleration*distance = (final velocity)^2-(initial velocity)^2

since here velocity is decreasing take acceleration negative.

equation in first case will be, 2*(-a)*d=0-(30)^2

in second case, 2*(-a)*D=0-(60)^2

insert value of (-a) from equation 1 and you get D= 4d.

Hope it will help.

Bye
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