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) Bill is pushing a rock. It’s a big rock with a mass of 83-kg. He...

) Bill is pushing a rock. It’s a big rock with a mass of 83-kg. He begins pushing lightly but pushes harder and harder until the rock begins to move. Once it moves, he continues applying the same force to the rock and it accelerates. The coefficient of static friction between the rock and the ground is µ s = 0.8 and the coefficient of kinetic friction between the rock and ground is µ k = 0.62.

(a) What force was Bill applying to the rock when it began to accelerate?

(b) What was the acceleration of the rock once it was moving?

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