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An object of mass 5 kg falls from rest t...

An object of mass 5 kg falls from rest through a vertical distance of `20 m` and attains a velocity of 10 m/s. How much work is done by the resistance of the air on the objrct?
`(g=10m//s^(2))`.

Text Solution

Verified by Experts

The correct Answer is:
`-750` J
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Knowledge Check

  • An object of mass 10 kg falls from rest through a vertical distance of 10 m and acquires a velocity of 10 ms^(-1) . The work done by the push of air on the object is (g = 10 ms^(-2) )

    A
    500 J
    B
    `-500 J`
    C
    `250 J`
    D
    `-250 J`

  • A body of mass 1 kg falls from rest through a distance of 200 m and acquires a speed of 50 m/s. Work done against friction of air is (Take g = 10 m//s^2)

    A
    700 J
    B
    1250 J
    C
    750 J
    D
    1960 J

  • A body of mass 1 kg is thrown upwards with a velocity of 20 m/s . It momentarily comes to rest after attaining a height of 18 m. How much energy is lost due to air friction? ( g = 10 m/s^(2))

    A
    `20 J`
    B
    `30 J`
    C
    `40 J`
    D
    `10 J`