Question 224: Laws of Motion

Question

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 immediately after the string is cut, are respectively

Accepted Answer

Before cutting the string
kx = T + 3 mg ...(i)
T = mg ...(ii)
$$ \Rightarrow $$ kx = 4mg
After cutting the string T = 0
$${a_A} = {{4mg - 3mg} \over {3m}}$$
$${a_A} = {g \over 3} \uparrow $$ and $${a_B} = {{mg} \over m} = g \downarrow $$

Answer

$${g \over 3},g$$

Answer

$$g, g$$

Answer

$${g \over 3},{g \over 3}$$

Answer

$$g,{g \over 3}$$

Laws of Motion

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 immediately after the string is cut, are respectively

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