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Vikkixo Vikkixo
  • 30-03-2016
  • Physics
Answered

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?

Verified Answer :

Anonymous Anonymous
  • 30-03-2016

mass = (2*KE) / v²
∴ the answer is 200/49 

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haleymeyer haleymeyer
  • 30-03-2016

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

Answer Link

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