Two children are moving on two skateboards at the same speed, child A has a mass of 20 kg whereas child B has 30 kg mass. Which child has higher kinetic energy?

1 J

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10 J

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Both have the same kinetic energy

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Both have potential energy.

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Solution

The correct option is B
10 J

Kinetic energy - $\frac{1}{2} \times m \times v^{2}$

Kinetic energy is directly proportional to mass and the square of the velocity since child B has a larger mass than child A, thus have higher kinetic energy

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Two children are moving on two skateboards at the same speed, child A has a mass of 20 kg whereas child B has 30 kg mass. Which child has higher kinetic energy?

The correct option is B 10 J Kinetic energy - 12×m×v2 Kinetic energy is directly proportional to mass and the square of the velocity since child B has a larger mass than child A, thus have higher kinetic energy

The correct option is B
10 J

Kinetic energy - $\frac{1}{2} \times m \times v^{2}$

Kinetic energy is directly proportional to mass and the square of the velocity since child B has a larger mass than child A, thus have higher kinetic energy