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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?

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?
asked 208k views
2 votes
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?

asked
User Mateva
by
8.3k points

2 Answers

4 votes
mass = (2*KE) / v²
∴ the answer is 200/49
answered
User Koque
by
7.8k points
4 votes
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
answered
User FabioG
by
8.6k points
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