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I need help with a physics question

Figure shows 3 boxes with mass 50kg, 20kg & 30kg on a frictionless surface.

1. What is the horizontal force required to push the system with an acceleration of 1ms-1?

2. Find the Force exerted by 50kg on 20kg

3. Find the force exerted by 20kg on 30kg

I was able to find the answer for the 1st question by using F=ma. And the answer i got was F=100N. But i don't know how to do question 2 & 3. So please help.

## Homework Statement

Figure shows 3 boxes with mass 50kg, 20kg & 30kg on a frictionless surface.

1. What is the horizontal force required to push the system with an acceleration of 1ms-1?

2. Find the Force exerted by 50kg on 20kg

3. Find the force exerted by 20kg on 30kg

## Homework Equations

## The Attempt at a Solution

I was able to find the answer for the 1st question by using F=ma. And the answer i got was F=100N. But i don't know how to do question 2 & 3. So please help.

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