A 40 kg bear slides, from rest, 14 m down a lodgepole pine tree, moving with a speed of 3.7 m/s just before hitting the ground. (a) What change occurs in the gravitational potential energy of the bear-Earth system during the slide? (b) What is the kinetic energy of the bear just before hitting the ground? (c) What is the average frictional force that acts on the sliding bear?

Explanation:

(a) Here, we have to take into account the earth's radius and the value of the Cavendish constant

The change is very low due to we consider the radius of the earth as the distance to the center of mass of the earth

(b).

(c). Is the force produced principally by the tree

I hope this is usefull for you

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.