Physics
Grade-7
Easy
Question
A body of mass 100 Kg moves with a kinetic energy of 2000 J. What will be its new kinetic energy if it moves at a speed of 50 m/s?
- 250000 J
- 125000 J
- 25000 J
- 12500 J
Hint:
125000 J
The correct answer is: 125000 J
m = 100 kg
v = 50 m/s
KE =
mv2
![equals space 1 half space straight x space 100 space cross times space 50 squared](data:image/png;base64,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)
= 125000 J
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