Determine the mechanical energy of this object: a 1-kg ball sits on a 10-meter high cliff.

a. the ball isn't moving, so the mechanical energy is zero
b. 10 j
c. 98 j
d. 980 j

also could you explain how you did it because i have know idea how to solve it

Give an example of a collision in real life. use the law of conservation of energy to describe the transfer of momentum. be sure and discuss the momentum before and after the collision occurs. you will need at least 3 sentences to thoroughly answer this question.