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## Homework Statement

Blocks with masses of 4.0 kg, 8.0 kg, and 9.0 kg are lined up in a row on a frictionless table. All three are pushed forward by a 15 N force applied to the 4.0 kg block.

1.) How much force does the 8.0 kg block exert on the 9.0 kg block?

2.)How much force does the 8.0 kg block exert on the 4.0 kg block?

## Homework Equations

F=ma

## The Attempt at a Solution

I found the acceleration of the blocks to be .71 m/s^2 because I did F/m=a or 15/(4+8+9)=.71

I don't know where to go from there or if that is even correct so far. Please let me know when you get a chance! Thank you!