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
= 945 J
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