1. Tardigrade
  2. Question
  3. Physics
  4. Two blocks, of mass 1 kg and 2 kg respectively, are connected by a spring and kept on a frictionless table. The blocks are pulled apart, so that the spring is stretched, and released from rest. At a certain instant of time, the block of mass 1 kg, is found to be moving at a speed 2 m / s. What must be the speed of the other block at this instant?

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Q. Two blocks, of mass $1\, kg$ and $2\, kg$ respectively, are connected by a spring and kept on a frictionless table. The blocks are pulled apart, so that the spring is stretched, and released from rest. At a certain instant of time, the block of mass $1 \,kg$, is found to be moving at a speed $2 \,m / s$. What must be the speed of the other block at this instant?

J & K CETJ & K CET 2012Laws of Motion

Solution:

According to conservation of linear momentum
$0=m_{1} v_{1}+m_{2} v_{2}$
$0=1 \times 2 \times 2 \times v^{2}$
$v_{2}=-1 m / s$
Negative sign shows that $ 2\,kg $
is pulled in a opposite direction to that of mass $ 1 \,kg $ .

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