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    Physics
    Grade-7
    Easy

    Question

    Direction : Calculate the missing term
    m = 12 kg
    v = ?
    K.E. = 240 J

    1. 2 square root of 10 m/s
    2. 20 m/s
    3. 40 m/s
    4. fraction numerator 10 over denominator square root of 2 end fraction m/s

    Hint:

    2√10 m/s

    The correct answer is: 2 square root of 10 m/s

      KE = 1 half mv2
      240 = 1 half × 12 × v2
      straight v squared space equals space 240 over 6

      = 40
      v = 2 square root of 10 m/s

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