February 23, 2017

Homework Help: Physics

Posted by Haley on Thursday, May 10, 2012 at 8:41pm.

A 4.00 103-kg car has a speed of 9 m/s. The car then hits a tree. The tree doesn't move and the car comes to rest.
(a) Find the change in kinetic energy of the car.
. J
(b) Find the amount of work done in pushing in the front of the car.
(c) Find the size of the force that pushed the front of the car in 50 cm.

- i got -2.00e+05 for the first answer and -4.00e+05 for the third, but neither worked?

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