Calculating the Speed of a Sports Car in a Collision

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The discussion focuses on calculating the speed of a 910-kg sports car that collides with a 3000-kg SUV, which is stationary at a red light. After the collision, both vehicles skid 2.8 meters before coming to a stop, with a coefficient of kinetic friction estimated at 0.80. Participants suggest using conservation of momentum to determine the initial speed of the sports car at impact, followed by applying constant acceleration equations. The calculations aim to find the speed in meters per second. The thread encourages engagement and sharing of results.
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A 910-{\rm kg} sports car collides into the rear end of a 3000-{\rm kg} SUV stopped at a red light. The bumpers lock, the brakes are locked, and the two cars skid forward 2.8 {\rm m} before stopping. The police officer, estimating the coefficient of kinetic friction between tires and road to be 0.80, calculates the speed of the sports car at impact.
What was that speed in m/s?
 
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Hi azzs! Welcome to PF! :wink:

Use conservation of momentum for the inital speed, and then use one of the standard constant acceleration equations.

Show us what you get. :smile:​
 
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