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Question

A block of mass m is connected with another block of mass 2m by a light spring. 2m is connected with a hanging mass 3m by an inextensible light string. At the time of release of block 3m?



Correct Answer
A

Tension in the string is 65mg.

Correct Answer
B

Acceleration of m is zero.

Your Answer
C

Acceleration of 3m is g2.

Correct Answer
D

Acceleration of 2m is 3g5.


Solution

The correct options are
A

Tension in the string is 65mg.


B

Acceleration of m is zero.


D

Acceleration of 2m is 3g5.


Just after release force in spring is zero.

 am=0 and   a2m=a3m=3mg5m=3g5

T=(2m) (3g5)

T=6mg5

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