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Mashutka [201]
3 years ago
13

A 1242 kg car is moving at 22.5 m/s when it skids to a stop. The car's brakes, which caused the stop, applied a force of -7210 N

in order to slow down the car. What was the acceleration of the car during it's slowing down to rest?
Physics
1 answer:
Debora [2.8K]3 years ago
8 0

The work needed to stop the car is

<em>W</em> = ∆<em>K</em> = 0 - 1/2 (1242 kg) (22.5 m/s)² ≈ -314 kJ

A stopping force that does this amount of work, pointing in the opposite direction with magnitude 7210 N, would be exerted over a distance <em>x</em> such that

<em>W</em> = (-7210 N) <em>x</em>   ==>   <em>x</em> ≈ 43.6 m

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