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A constant horizontal force of 20N is applied to block A (4.0kg) which is pushed against block B (6.0kg). The blocks slide over a surface, along the x-axis. What is the force from block A on block B when...

a) friction is neglected

b) when the coefficient of kinetic friction between the blocks and surface is .1

For part a I used F=ma to find the acceleration to equal 2 m/s/s. I am confused what to do after that.

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