Question

4. A car expends an energy of 25,000 J while moving at a constant speed of 5 ms
What is the mas
car?
Ans. 2000kg​

Answer 1

Answer:-

$\implies$Mass of the car = $\bf{2000 \: kg}$

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• Given:-

K.E of the Car =$\bf{25,000 \: J}$

Velocity of the car =$\bf{5 \: ms^{-1}}$

• Solution:-

We know,

$\bf\boxed{K.E = \dfrac{1}{2}mv^2}$

therefore,

$\implies 25000 = \dfrac{1}{2}m \times (5)^2$

$\implies{25000 = \dfrac{1}{2}m \times 25}$

$\implies{25000 \times 2 = m \times 25}$

$\implies{50000 = m \times 25}$

$\implies{\dfrac{50000}{25}} = m$

$\bf\implies{m = 2000 \: kg}$

Hence,

Mass of the car is $\bf{2000 \: kg}$.

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