First slide

Kinetic energy

Question

The KE of a body moving with a speed of 10 m/s is 30 J. If its speed becomes 30 m/s, its KE will be :

Easy

A

10 joule
B

90 joule
C

180 joule
D

270 joule

Solution

$KE \propto v^{2} \Rightarrow KE' = KE \cdot {(\frac{v'}{v})}^{2} = 30 \times {(\frac{30}{10})}^{2} = 270 J$

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