# Physics

If a rock weighs 783 N on earth, what is its mass?
A. 87.0

B. 79.9

C. 78.6

D.77.5

Is it B?

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1. m g = 783 N
so
m = 783/g
so
m = 783/9.8 = 79.9
so yes, right

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2. You better get this weight = force = mass * acceleration of gravity thing

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3. Thank you!

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4. You are welcome.

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