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Work done by air resistance on a falling body from its final speed

This type of question, asked 2 times: 2021 Paper 24, 6 Apr 2026 S1. All 2 questions below, oldest first.

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  1. Question 1

    2021 Paper 24

    4
    A body of mass 'm' dropped from a height ' hh ' reaches the ground with a speed of 0.8gh0.8\sqrt{gh}. The value of workdone by the air-friction is:

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  2. Question 2

    6 Apr 2026 S1

    3
    The rain drop of mass 1 g , starts with zero velocity from a height of 1 km . It hits the ground with a speed of 5 m/s5\text{ }m/s. The work done by the unknown resistive force is ____\_\_\_\_ J . (take g=10 m/s2g = 10\text{ }m/s^{2} )

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