A 4.0 kg body has 200 J of kinetic energy. What is the speed of the body?
1 12.4 m / s
2 14 m / s
3 10 m / s
4 16 m /
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Answer:
3. 10 m /s.
Explanation:
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Given, mass=4kg
Kinetic energy=200j
v=?
Kinetic energy =1/2mv2
200j=1/2×4kg×v2
200=2v2
100= v2
v =√100
v=10
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