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------------------------------------------------ A rock falls off a cliff with an acceleration of 9.8 m/s². What is the mass of the rock if the fall produces a force of 147 N?

A. 3 kg
B. 6 kg
C. 9 kg
D. 12 kg

The mass of the rock can be calculated using Newton's second law of motion, F = ma. For a force of 147 N and an acceleration of 9.8 m/s², the mass would be 147 N / 9.8 m/s² = 15 kg. However, this answer is not listed in the provided options, suggesting a possible typo or mistake in the question or calculation.

Explanation:

To calculate the mass of the rock, we can use Newton's second law of motion, which states that force equals mass times acceleration (F = ma). Given the force (F) of 147 N and the acceleration due to gravity (a) of 9.8 m/s², we can rearrange this equation to solve for the mass (m).

m = F / a

m = 147 N / 9.8 m/s² = 15 kg

However, this value is not listed in the provided options. It appears there may be a typo or mistake in the calculation. If you meant the force to be 147 N, then the correct mass would indeed be 15 kg. Please double-check the force value and calculation to ensure the correct answer from the given choices.