Question

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?

Answer 1

m g = 783 N
so
m = 783/g
g is about 9.8 m/s^2
so
m = 783/9.8 = 79.9
so yes, right

Answer 2

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

Answer 3

Thank you!

Answer 4

You are welcome.