Two blocks A and B of masses 3m and m respectively are connected by a massless and inextensible string. The whole system is suspended by a massless spring as shown in figure. The magnitudes of acceleration of A and B

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Correct answer: B. (g)/(3), g

Two blocks A and B of masses 3m and m respectively are connected by a massless and inextensible string. The whole

Before the string is cut, tension is acting in the string in downward position.

kx = T + 3mg

......(i)

T = mg

......(ii)

Two blocks A and B of masses 3m and m respectively are connected by a massless and inextensible string. The whole

⇒ kx = 4mg

After the string is cut,

T = 0

a = \dfrac{kx - 3mg}{3m}

a = \dfrac{4mg - 3mg}{3m}

Acceleration of

A

is

a = \dfrac{g}{3} ↑

and acceleration of

B

is

a = \dfrac{mg}{m} = g ↓

.

Two blocks A and B of masses 3m and m respectively are connected by...

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