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A drunk driver in a 1700 kg car plows into a 1700 kg parked car with its brake set. Police...

Question:

A drunk driver in a 1700 kg car plows into a 1700 kg parked car with its brake set. Police measurements show that the two cars skid together a distance of 27 m before stopping. If the effective coefficient of friction is 0.73, how fast was the drunk going just before the collision?

Work:

Doing work involves moving an object. Exerting a force on an object that causes the object to move does work on the object. Friction does negative work because it doesn't cause the object to move, but it retards is motion.

Answer and Explanation:

The velocity of the car initially before the collision is 39.3 m/s.

Momentum is conserved in collisions.

  • p is momentum.
  • m is mass.

{eq}\Sigma...

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Practice Applying Work & Kinetic Energy Formulas

from Physics 101: Help and Review

Chapter 17 / Lesson 4
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