Physics
Grade-7
Easy
Question
A person starts running at a speed of 30 cm/s. His weight is 1200 N. Considering the g as 10 m/s, what is its kinetic energy?
- 3.6 J
- 1.2 J
- 36 J
- 12 J
Hint:
3.6 J
The correct answer is: 3.6 J
m = ![1200 over 10](data:image/png;base64,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)
= 120 kg
v = 30 ![vm over straight s](data:image/png;base64,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)
![equals space 30 over 100 space straight m over straight s](data:image/png;base64,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)
KE =
mv2
![equals space fraction numerator 1 over denominator up diagonal strike 2 end fraction space cross times space up diagonal strike 12 with 6 on top end strike up diagonal strike 0 space cross times space fraction numerator 3 up diagonal strike 0 over denominator 1 up diagonal strike 00 end fraction cross times fraction numerator 3 up diagonal strike 0 over denominator 10 up diagonal strike 0 end fraction
equals space 36 over 10 space equals space 3.6 space straight J](data:image/png;base64,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)
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![KE space equals space 2 mv squared](data:image/png;base64,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)
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![KE space equals space 2 mv squared](data:image/png;base64,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)
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