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# Introduction to Forces

They say you can't go anywhere without forces, and they are right. See if you understand the bread and butter of Newtonian mechanics.

Two boats \(A\) and \(B,\) connected with a string, are floating on a calm lake. The mass of \(A\) and \(B\) are \( 100 \text{ kg} \) and \( 150 \text{ kg}, \) respectively, and the distance between them is \( 30 \text{ m}. \) If the string is pulled from boat \(A\) with a constant force and the two boats meet in \( 20 \text{ seconds}, \) what is **the distance that boat A moves**?

Suppose that there is no friction whatsoever.

A \( 72 \text{ kg} \) package lying on the ground is connected to a massless rope that runs over a frictionless tree limb. If a \( 40 \text{ kg} \) monkey climbs up the other side of the rope, what is the magnitude of the minimum acceleration at which the monkey should climb for the package to be lifted off the ground?

The gravitational acceleration is \( g= 10 \text{ m/s}^2 . \)

Find \(m_A/m_B\).

You are holding onto a \(100~\mbox{kg}\) basket of fish hanging over the side of a boat. What is the minimum force **in Newtons** you need to exert to keep the basket from falling back down into the ocean?

**Details and assumptions**

- The acceleration of gravity is \(-9.8~\mbox{m/s}^2\).

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