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.

J

(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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