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Physics

Grade-7

Easy

Question

Direction : Calculate the missing term
m = 12 kg
v = ?
K.E. = 240 J

2 $\sqrt{10}$ m/s
20 m/s
40 m/s
$\frac{10}{\sqrt{2}}$ m/s

hint Hint:

2√10 m/s

The correct answer is: 2 $square root of 10$ m/s

KE = $1 half$ mv²
240 = $1 half$ × 12 × v²
^{$straight v squared space equals space 240 over 6$}
= 40
v = 2 $square root of 10$ m/s

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