A1904 kg car has a speed of 12 m/s when it hits a tree. the tree doesn’t move and the car comes to rest.
find the change in kinetic energy of the car. answer in units of j.

On mars a rock falls an unknown vertical distance from a resting position and lands in a crater. if it takes the rock 2.5 seconds to fall, how high is the cliff the rock fell from? mars' surface gravity is 3.8 m/s2. a. 9.5 m b. 11.9 m c. 15.2 m d. 23.8 m