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16 March, 23:18

A rock hits the ground with a speed of 7 m/s and a kinetic energy of 100 J. What is the rock's mass?

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Answers (2)
  1. 16 March, 23:37
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    Mass = (2*KE) / v²

    ∴ the answer is 200/49
  2. 17 March, 02:57
    0
    KE=1/2 times mass times velocity squared. So in this situation your equation would look like this 100J=1/2 times mass times 7 m/s^2. Your answer would be 4.0812 kg
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