Question

Three solids of masses `m_(1),m_(2)` and `m_(3)` are connected with weightless string in succession and are placed on a frictionless table. If the mass `m_(3)` is dragged with a force T , the tension in the string between `m_(2)` and `m_(3)` is
A. `(m_(2))/(m_(1)+m_(2)+m_(3))T`
B. `(m_(3))/(m_(1)+m_(2)+m_(3))T`
C. `(m_(1)+m_(2))/(m_(1)+m_(2)+m_(3))T`
D. `(m_(2)+m_(3))/(m_(1)+m_(2)+m_(3))T`

Answer 1

Correct Answer - C

`T=(m_(1)+m_(2)+m_(3))a`
`T-T_(1)=m_(3)a`
`T_(1)=T-m_(3)a`
`=T-(m_(3))/((m_(1)+m_(2)+m_(3))xxT)=(T(m_(1)+m_(2)))/((m_(1)+m_(2)+m_(3)))`