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Mechanics

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 Joined: 28 Feb 2010 Post: 3
28 Feb 2010 17:10:42 IST
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When coming to a stop, a vehicle leaves skid marks 80 m long on the highway. Assuming a deceleration
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When coming to a stop, a vehicle leaves skid marks 80 m long on the highway. Assuming a deceleration of 7.50 m/s2, find the speed of the car just before braking.

Blazing goIITian

Joined: 29 Mar 2008
Posts: 454
28 Feb 2010 18:58:47 IST
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its initial velocity before breaking was - 34.64m/s

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Joined: 19 Oct 2006
Posts: 7804
28 Feb 2010 22:46:26 IST
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Using v2 - u2 = 2aS

S = 80m

a = -7.5 m/s2

v = 0

Thus  - u2  = -  2 * 7.5 * 80

or u = 34.64 m/s

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