1. Tardigrade
  2. Question
  3. Physics
  4. Two blocks A and B of masses 3 m 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 :

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. Two blocks $A$ and $B$ of masses $3\,m$ 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 :Physics Question Image

NEETNEET 2017Laws of Motion

Solution:

image
Before the string is cut
$k x=T+3 m g$...(1)
$T=m g$...(2)
image
$\Rightarrow k x=4 m g$
After the string is cut, $T=0$
$a=\frac{k x-3 m g}{3 m}$
$a=\frac{4 m g-3 m g}{3 m}$
$a=\frac{g}{3} \uparrow$
image