Question

A man thinks about 4 arrangements as shown to raise two small bricks each having mass $m$. Which of the arrangement would take minimum time for the same force applied ?

• A.
• B.
• C.
• D.

Answer 1

The correct option is A

In case (a) acceleration, $a=\frac{2F-2mg}{2m}$
In case (b) acceleration, $a=\frac{F-2mg}{2m}$
In case (c) acceleration, $a=\frac{F-2mg}{2m}$
In case (d) acceleration, $a=\frac{\frac{F}{2}-2mg}{2m}$
For minimum time acceleration should be maximum.