Physics
Grade-7
Easy
Question
There is a bell at the top of a tower that is 45 m high. The bell weighs 190 N. The bell straps break, and it comes tumbling down at a speed of 15 m/s. What is its kinetic energy?
- 2181 J
- 2000 J
- 2200 J
- 21375 J
Hint:
2181 J
The correct answer is: 2181 J
m =
kg
v = 15 m/s
KE =
mv2
![equals space 1 half space cross times space fraction numerator 190 over denominator 9.8 end fraction space cross times space 15 space cross times space 15](data:image/png;base64,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)
= 2181.122 J
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![KE space equals space 2 mv squared](data:image/png;base64,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)
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