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The system shown in figure is initially ...

The system shown in figure is initially in equilibrium. What is the acceleration of B just after the string connecting B to ground is cut ?

A

(a)g downwards

B

(b)`(g)/(3)` upwards

C

(c)zero

D

(d)g upwards

Text Solution

Verified by Experts

The correct Answer is:
D
Before the string is cut, tension in the spring = 2mg
Tension in spring doesn’t change instantly,
So, just after the string is cut, tension in spring is still 2mg
`a_(B) = (2m g - mg)/(m) = g` upwards
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