The brochure advertising a sports car states that the car canbe moving at 100.0

Question

The brochure advertising a sports car states that the car canbe moving at 100.0 km/h, and stop in 39.75 meters. What is itsaverage acceleration during a stop from that velocity? Express youranswer in m/s^2. Consider the car's initial velocity to be apositive quantity. The brochure advertising a sports car states that the car canbe moving at 100.0 km/h, and stop in 39.75 meters. What is itsaverage acceleration during a stop from that velocity? Express youranswer in m/s^2. Consider the car's initial velocity to be apositive quantity.

Explanation / Answer

    initial velocity, U = 100 km/h = 100 * 5 / 18m/s = 27.78 m/s     final velocity, V = 0     displacement, S = 39.75 m     acceleration, a = ( V2 -U2 ) / 2 S                           = - 9.71m/s^2           ( Here '-' sign represent retardation )

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