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Look at the rock sitting on the hill in the picture above. Gravity should make the rock slide down the hill. What force is acting to balance gravity, keeping the rock in place?

Acentripetal force
Bgravity
Cmomentum
Dfriction

Verified Answer :

Look at the rock sitting on the hill in the picture above. Gravity should make the rock slide down the hill. What force is acting to balance gravity,keeping the rock in place? - D. friction
Centripetal force and momentum have to do with movement. Gravity cannot balance gravity. 

Answer:

Friction

Explanation:Thats what the verified anser says.