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Q.

A 1kg block is dropped from a height of 0.4m on a spring of force constant 980Nm−1 . The maximum compression of the spring is

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a

10 cm

b

20 cm

c

30 cm

d

40 cm

answer is A.

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Detailed Solution

mg(h+x)=12kx2                       1×9.8(0.4+x)=12×980×x2 250x2-5x-2=0                ⇒x=10cm
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