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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 Hint:

945 J

The correct answer is: 945 J

m = 2.1 kg
v = 30 m/s
KE = $1 half$ mv²
$equals space 1 half space cross times space 2.1 space cross times space left parenthesis 30 right parenthesis squared$
= 945 J

Related Questions to study

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