Answer :
Final answer:
The mass of the falling rock is a.15 kg.
Explanation:
The mass of a falling rock can be found by using Newton's second law, which states that force is equal to mass multiplied by acceleration. In this case, the force exerted by the rock is given as 147 N and the acceleration due to gravity is 9.8 m/s². Rearranging the formula, we can solve for mass: mass = force / acceleration. Substituting the given values, we get mass = 147 N / 9.8 m/s² = 15 kg.
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