Physics
Grade-7
Easy
Question
Hari serves a volleyball with a mass of 2.1 Kg. The ball leaves his hand at a speed of 30 m/s. How much kinetic energy does the ball have?
- 945 J
- 9450 J
- 31.5 J
- 315 J
Hint:
945 J
The correct answer is: 945 J
m = 2.1 kg
v = 30 m/s
KE =
mv2
![equals space 1 half space cross times space 2.1 space cross times space left parenthesis 30 right parenthesis squared](data:image/png;base64,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)
= 945 J
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