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Old Jan 30th 2009, 04:55 AM   #1
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A car travels at a uniform velocity of 20 m/s for 5s.The brakes are then applied and the car comes to rest with uniform retardation in a further 8 s.How far does the car travel after brakes are applied????
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Old Jan 30th 2009, 05:39 AM   #2
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If it has constant deceleration, you can use s=v.t, where v is the average velocity v_avg=(v_init+v_final)/2.
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Old Jan 30th 2009, 11:30 PM   #3
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Originally Posted by Tabassum View Post
A car travels at a uniform velocity of 20 m/s for 5s.The brakes are then applied and the car comes to rest with uniform retardation in a further 8 s.How far does the car travel after brakes are applied????
you can use the formula $\displaystyle a=\frac{v_1-v_0}{t}$
where $\displaystyle v_0= 20$ and$\displaystyle v_1=0$ since its retardation you will get $\displaystyle a$ as negative. Put these values in the formul
$\displaystyle s=v_o.t + \frac{1}{2}.a.t^2$.

Last edited by the curious; Jan 30th 2009 at 11:32 PM.
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