Q.

The springs shown are identical. When A=4kg , the elongation of spring is 1 cm. If B=6kg, the elongation produced by it is

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a

4 cm

b

3 cm

c

2 cm

d

1 cm

answer is B.

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Detailed Solution

F=kx⇒mg=kx⇒m∝kxHence  m1m2=k1k2×x1x2⇒46=kk/2×1x2⇒x2=3 cm.
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The springs shown are identical. When A=4kg , the elongation of spring is 1 cm. If B=6kg, the elongation produced by it is