As shown in figure, two blocks are connected with a light spring. When spring was at its natural length, velocities are given to them as shown in figure. Choose the wrong alternative.

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At the time of maximum compression both blocks are moving in same direction.

When spring is maximum elongated velocity of 10 kg block is 3 m/s towards left

When spring is maximum compressed velocity of 20 kg block is 3 m/s towards right

Velocity of center of mass of the system is 3 m/s towards right

answer is C.

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Detailed Solution

$v_{c m} = \frac{20 \times 6 - 10 \times 3}{20 + 10} = 3$ m/s towards right.
At the time of either maximum elongation or compression, both the blocks will be moving with a common velocity =3 m/s towards right.

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