Homework Help: Physics

Posted by kago on Thursday, October 20, 2011 at 11:30pm.

A 0.90 × 10^3 kg sports car collides into the rear end of a 2.4 × 10^3 kg SUV stopped at a red light. The bumpers lock, the brakes are locked, and the two cars skid forward 4.6 m before stopping. The police officer, estimating the coefficient of kinetic friction between tires and road to be 0.40, calculates the speed of the sports car at impact. What was that speed?

Physics - drwls, Friday, October 21, 2011 at 1:56am
The sliding distance can be used to compute the kinetic energy of the joined cars.
(friction force)*X = Kinetic energy at the beginning of skid.
From the KE and masses, get the initial momentum of the joined cars.

Once you have the momentum of the joined cars, you know that it equals the momentum of the sports car before collision.

Answer this Question

Related Questions

Physics - A 930 kg sports car collides into the rear end of a 2500 kg SUV ...
Physics - A 930 kg sports car collides into the rear end of a 2500 kg SUV ...
Physics - Please Help!!! A 920 kg sports car collides into the rear end of a ...
physics - A 820-{\rm kg} sports car collides into the rear end of a 2700-{\rm kg...
physics - A 820-{\rm kg} sports car collides into the rear end of a 2700-{\rm kg...
Physics - A 920 kg sports car collides into the rear end of a 2300 kg SUV ...
Physics - A 930 kg sports car collides into the rear end of a 2500 kg SUV ...
Physics - A 930 kg sports car collides into the rear end of a 2500 kg SUV ...
physics - A 910 kg sports car slows down to 6.0 m/s to read a cross street sign...
Physics - A car of mass 1100 kg, moving with a speed of 73 mph on a highway, ...

For Further Reading

First Name:
School Subject:
Answer: