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Standard XII

Physics

Ropes

Two blocks A ...

Question

Two blocks $A$ and $B$ of masses $m$ and $2 m$ respectively are held at rest such that the spring is in natural length. Find out the accelerations of both the blocks just after release:

g ↓, g ↓

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\frac{g}{3} ↓, \frac{g}{3} ↑

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0, 0

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g ↓, 0

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Solution

The correct option is A $g ↓, g ↓$
In this case spring force is zero initially
F.B.D of $A$ and $B$

Writing Newton's second law for both blocks,
$F n e t = m a$
$∴ a = \frac{F n e t}{m}$
Since, there is only gravitational force acting on both blocks
$a = g$ for both blocks.

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Two blocks A and B of masses m and 2m respectively are held at rest such that the spring is in natural length. Find out the accelerations of both the blocks just after release:

The correct option is A g↓,g↓In this case spring force is zero initially F.B.D of A and B Writing Newton's second law for both blocks, Fnet=ma ∴a=Fnetm Since, there is only gravitational force acting on both blocks a=g for both blocks.

Two blocks $A$ and $B$ of masses $m$ and $2 m$ respectively are held at rest such that the spring is in natural length. Find out the accelerations of both the blocks just after release:

The correct option is A $g ↓, g ↓$
In this case spring force is zero initially
F.B.D of $A$ and $B$

Writing Newton's second law for both blocks,
$F n e t = m a$
$∴ a = \frac{F n e t}{m}$
Since, there is only gravitational force acting on both blocks
$a = g$ for both blocks.