Physics Help Forum what distance does this car require to stop when it s travelling twice as fast?

 Kinematics and Dynamics Kinematics and Dynamics Physics Help Forum

 Jan 31st 2010, 12:12 PM #1 Junior Member   Join Date: Jan 2010 Posts: 11 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
 Feb 1st 2010, 02:44 AM #2 Member   Join Date: Jan 2010 Posts: 48 reply 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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