In the figure shown initial spring is in unstretched state and blocks are at rest
Channel: Doubtnut
Date: 19/01/2020

In the figure shown initial spring is in unstretched state and blocks are at rest. Now `100 N` force is applied on block `A and B` as shown in figure. After same time velocity of \'a\' becomes `2 m//s` and that of \'B\' `4 m//s` and block A displaced by amount `10 cm` and spring is spring is streched by amount `30 cm`. Then work done by spring force on `A` will be: