Barbara pushes her friend sharon on a skateboard. barbara applies a force of 225 n and sharon's acceleration is 2.3 m/s2. what is the combined mass of sharon and her skateboard?

F = m*a
(Force) = (mass x acceleration)

1)     Plug the numbers into the corresponding variables using parentheses:

(225) = m*(2.3)

2)     Divide 2.3 on each side so that  the variable and the numbers are not separate sides 

225/2.3 = m* 2.3/2.3
97.83 = m

3)     Rewrite your answer.

The combined mass of Sharon and her skateboard is 97.83 kg. 
(Remember that kg or kilograms is the proper SI Unit for mass)\

Hope this helps!! 

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