A 2.0 kg rock sits on the edge of a cliff 12 m above thebeach. a. Potential Enge

Question

A 2.0 kg rock sits on the edge of a cliff 12 m above thebeach. a. Potential Engery Calculate the potentialengery in the system. b. Engery Transformation The rock falls offthe cliff. How much kinetic engery will it have just before it hitsthe beach? (Ignore air resistance) c. Kinetic Engery Calculate the speed of therock just before it hits the beach. d. Consevation of Engery What happens to theengery after the rock hits the beach? A 2.0 kg rock sits on the edge of a cliff 12 m above thebeach. a. Potential Engery Calculate the potentialengery in the system. b. Engery Transformation The rock falls offthe cliff. How much kinetic engery will it have just before it hitsthe beach? (Ignore air resistance) c. Kinetic Engery Calculate the speed of therock just before it hits the beach. d. Consevation of Engery What happens to theengery after the rock hits the beach?

Explanation / Answer

A 2.0 kg rock sits on the edge of a cliff 12 m above thebeach. a. Potential Engery Calculate the potentialengery in the system.
mgh=2*9.81*12=235.44 J

b. Engery Transformation The rock falls offthe cliff. How much kinetic engery will it have just before it hitsthe beach? (Ignore air resistance)
all potential would change to kinetic
235.44J

c. Kinetic Engery Calculate the speed of therock just before it hits the beach.
KE=1/2 m v2
1/2 2 v2=235.44
15.344m/s=v

d. Consevation of Engery What happens to the engery afterthe rock hits the beach?
collision, all energy is transfered to the sand i guess, not sureabout this one

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