Respuesta :

ponytom13

Answer:

0 Newton

Explanation:

We have the formula F=m*a. Given the mass = 12kg and a = 0 ( I assume that the rock is rolling down at a constant velocity of 4.7m/s which its acceleration is 0)

So we have F = 12*0 = 0 N.

Hope that is what you are looking for.

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