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Laws of Motion question

2017 · Q148
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Laws of Motion question

2017 · Q148

NEETPhysicsLaws of MotionMCQ+4 / −1
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

NEET 2017 Physics - Laws of Motion Question 26 English
  1. A
    g3,g{g \over 3},g3g​,g
  2. B
    g,gg, gg,g
  3. C
    g3,g3{g \over 3},{g \over 3}3g​,3g​
  4. D
    g,g3g,{g \over 3}g,3g​
View written solutionFree

Correct answer: A

NEET 2017 Physics - Laws of Motion Question 26 English Explanation 1
Before cutting the string
kx = T + 3 mg ...(i)
T = mg ...(ii)
$ \Rightarrow $ kx = 4mg

After cutting the string T = 0
$${a_A} = {{4mg - 3mg} \over {3m}}$$

NEET 2017 Physics - Laws of Motion Question 26 English Explanation 2

$${a_A} = {g \over 3} \uparrow $$ and $${a_B} = {{mg} \over m} = g \downarrow $$
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