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+3 votes
in Physics by (2.8k points)
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Two blocks of mass 3 kg and 6 kg respectively are placed on a smooth horizontal surface. They are connected by a light spring of force constant k=200 N/m. Initially the spring is unstretched. The indicated velocities are impacted to the blocks. Find the maximum extension of the spring.

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by (9.9k points)
Best answer

Correct option is (1)


At maximum extension velocity of both the blocks will be same. Let v be the common velocity of the blocks (towards right). From conservation of linear momentum.

or v=1m/s
Now let x be the maximum extension in the spring.
From conservation of mechanical energy
1/2 x (3)(1)2+1/2 x (6)(2)2=2(200)x2+1/2 x (9)(1)2
or 3+24=200x2+9
or x=√(18/200)
or x=0.3 m
x=30 cm

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