A monkey pulls the midpoint of a long

PHYSICS · Single correct · AP · Physics 1: Algebra-based · Force and Translational Dynamics · Force and Translational Dynamics

Problem

A monkey pulls the midpoint of a

10\,\text{cm}

long, light, inextensible string connecting two identical objects

A

and

B

, each of mass

0.3\,\text{kg}

, lying on a smooth table. The midpoint is pulled continuously along the perpendicular bisector of the line joining the masses. When the masses are

6\,\text{cm}

apart, their relative acceleration is

5\,\text{m s}^{-2}

. The constant force applied by the monkey is: (1)

4\,\text{N}

(2)

2\,\text{N}

(3)

3\,\text{N}

(4) None of these