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A car is moving with a velocity of $54 km/h$ . The Kinetic Energy of a boy of mass 40 kg sitting in the car is

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4500 J

450 J

0.45 J

45 J

answer is A.

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Detailed Solution

$v = 54 km/h$

$=54 \times \frac{5}{18} = 15 m/s$

Mass of boy(m) = 40 kg

$K.E = \frac{1}{2} {mv}^{2}$

$= \frac{1}{2} \times 40 \times {(15)}^{2}$

$= 20 \times 225 = 4500 J$

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