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In fig. both pulleys and the string are ...

In fig. both pulleys and the string are massless and all the surfaces are frictionless.

Given `m_(1)=1kg, m_(2)= 2kg, m_(3)=3kg`.
The acceleration of `m_(3)` is

A

`(40)/(7) ms^(-2)`

B

`(30)/(7) ms^(-2)`

C

`(20)/(7) ms^(-2)`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B
Free-body diagrams

Constraint relation :
`x_(1)=x_(2)+x_(3)`
`a_(1)=a_(2)+a_(3)`
Equation of motion :
`T-N=m_(1)a_(1)` …(i)
`N=m_(2)a_(1)`..(ii)
`m_(2)g-T=m_(2)a_(2)` …(iii)
`m_(3)g-T=m_(3)a_(3)` ..(iv)
Using above equations, we can calculate the values.
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CENGAGE PHYSICS ENGLISH-NEWTON'S LAWS OF MOTION 1-Linked Comperhension
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