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Consider a drop of rain water having mas...

Consider a drop of rain water having mass 1 g falling from a height of `1 km`. It hits the ground with a speed of `50 m//s` Take `g` constant with a volume `10 m//s^(2)`. The work done by the
(i) gravitational force and the
(ii) resistive force of air is :

A

`(i)-10J" "(ii) -8.25J`

B

`(i)1.25J" "(ii)-8.25J`

C

`(i)100J" "(ii)8.75J`

D

`(i)10J" "(ii)-8.75J`

Text Solution

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The correct Answer is:
D
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Knowledge Check

  • Consider a drop of rain water having mass 1 g falling from a height of 1 km. It hits the ground with a speed of 50 ms^(-1) . Take .g. constant with a value 10 ms^(-2) . The work done by the (i) gravitational force and the (ii) resistive force of air is

    A
    (i) `1.25 J " " `(ii) `-8.25 J`
    B
    (i) `100 J " "` (ii) `8.75 J`
    C
    (i) `10 J " " ` (ii) `-8.75 J`
    D
    (i) `-10 J " " ` (ii) `- 8.25 J`

  • Consider a drop of rain water having mass 1 g falling from a height of 1 km. It hits the ground with a speed of 50 m/s. Take 'g constant with a value 10 m/ s^2 . The work done by the (1) gravitational force and the (ii) resistive force of air

    A
    (i) 1.25 J (ii) -8.25 J
    B
    (i) 100 J (ii) 8.75 J
    C
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    D
    (i) -10 J (ii) -8.25 J

  • A stone of mass 20 g falling from height of 2 km hits the ground with a speed of 200 ms^-1 . The work done by the gravitational force is

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