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Homework Statement
A student pushes a block with 240 N of force across a horizontal surface with a coefficient of kinetic friction of 0.4. The block accelerates at a rate of 0.88 m/s2. Find the mass of the block.
Homework Equations
μK = FK / FN
F=ma
The Attempt at a Solution
My first attempt was to figure out mass using F=ma
m = f/a
= 240 N / 0.88 m/s2
= 272.7 kg
but this is not taking into account the kinetic friction...
So what I did was
FK = μK x FN
= 0.4 x (272.7 kg x 9.8 m/s2
= 1069.1 N
I know I'm doing this wrong and I need to know how to derive at net force to find acceleration