Physics

Problem

Three identical carts

A,\,B

and

C

, each of mass

2\,\text{kg}

, are connected in a line by light strings on a smooth horizontal track. A constant horizontal force of

18\,\text{N}

is applied to cart

A

in the direction

A \rightarrow B \rightarrow C

. The tension in the string between carts

B

and

C

is a)

9\,\text{N}

6\,\text{N}

12\,\text{N}

3\,\text{N}