Martha drops a 1 kg rock off the top of Black Oak Canyon which is 100m deep. What is the KE of the rock the instant

Question

before it hits bottom? Hint: Conservation of energy states that PE = KE

Answer 1

KE=mgh=1*g*100=9800joules

Answer 2

@bobpursley:
9.8*100 is actually 980, not 9800