If a 28-N force causes a rock to accelerate at 4 m/s/s, what is the mass of the rock?

7kg

Explanation:

Given parameters:

Force on the rock  = 28N

Acceleration  = 4m/s²

Unknown:

Mass of the rock  = ?

Solution:

According to newton's second law of motion;

           Force  = mass x acceleration

Insert the given parameters to find the mass;

         28  = mass x 4

             mass  =   = 7kg

the entire statement is true and correct.  

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