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If a man increase his speed by 2m/s, his...

If a man increase his speed by 2m/s, his K.E. is doubled, the original speed of the man is

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To solve the problem, we need to find the original speed of a man whose kinetic energy doubles when he increases his speed by 2 m/s. Let's go through the solution step by step. ### Step 1: Define the variables Let: - \( v \) = original speed of the man (in m/s) - \( m \) = mass of the man (in kg) ### Step 2: Write the formula for kinetic energy ...
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Knowledge Check

  • A man who is running has half the kinetic energy of a boy of half his mass. The man speeds up by 1 ms^(-1) and then has the same kinetic energy as the boy. The original speeds of the man and the boy was:

    A
    `2.4 m s^(-1), 1.2 m s^(-1)`
    B
    `1.2 m s^(-1), 4.4 m s^(-1)`
    C
    `2.4 m s^(-1), 4.8 m s^(-1)`
    D
    `4.8 m s^(-1), 2.4 m s^(-1)`

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