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Natural length of a spring is 60 cm, and...

Natural length of a spring is 60 cm, and its spring constant is 4000 N/m, A mass of 20 kg is hung from it. The extension produced in the spring is (take `g=9.8m//s^(2)`)

A

4.9 cm

B

0.49 cm

C

9.4 cm

D

0.94 cm

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • Natural length of a spring is 60 cm and its spring constant is 4000 N/m. A mass of 20 kg is hung from it. The extension produced in the spring is (Take, g = 9.8 m//s^(2) )

    A
    4.9 cm
    B
    0.49 cm
    C
    9.4 cm
    D
    0.94 cm

  • In spring constant of the spring is 100 N//m Extension produced in the spring is: (g=10 m//s^(2))

    A
    10 cm
    B
    20 cm
    C
    30 cm
    D
    40 cm

  • A spring has natural length 40 cm and spring constant 500 N//m . A block of mass 1 kg is attached at one end of the spring and other end of the spring is attached to a ceiling. The block is relesed from the position, where the spring has length 45 cm .

    A
    the block will perform SHM of amplitude `5cm`
    B
    the block will have maximum velocity `30 sqrt (5) cm//s`
    C
    the block will have maximum acceleration `15 m//s^(2)`
    D
    the minimum elastic potential energy of the spring will be zero

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