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?

## Answer This Question

## Related Questions

- Physics - A car with a total mass of 1.48 103 kg has wheels of radius 33.5 cm ...
- Physics - The driver of a car slams on the brakes when he sees a tree blocking ...
- physics - The driver of a car slams on the brakes when he sees a tree blocking ...
- physics - The driver of a car slams on the brakes when he sees a tree blocking ...
- physics - Let a force of 1500 Newtons act through a distance of 200 meters on a ...
- physics - A car has a flywheel ( a diks of R=0.2m and uniformly distributed mass...
- physics- pls help me - 1. The driver of a car slams on the brakes when he sees a...
- Physics - A mechanic pushes a 2.60 103-kg car from rest to a speed of v, doing 5...
- Physics - A mechanic pushes a 2.60 103-kg car from rest to a speed of v, doing 5...
- physics - a couple part in a car on moonlit evening. Find that their car is stop...

More Related Questions