The work done to increase the velocity of a car from $30 m / s$ to $40 m / s,$ if the mass of the car is $1000 k g$ is

350 J

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350 k J

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3.5 k J

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3.5 J

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Solution

The correct option is B $350 k J$
W.D = Change in K.E
$= \frac{1}{2} m (v^{2} - u^{2})$
$= \frac{1}{2} \times 1000 (40^{2} - 30^{2})$
$= \frac{1}{2} \times 1000 \times 700$
$= 350 k J$

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The work done to increase the velocity of a car from 30m/s to 40m/s, if the mass of the car is 1000kg is

The correct option is B 350kJW.D = Change in K.E =12m(v2−u2) =12×1000(402−302) =12×1000×700 =350kJ

The work done to increase the velocity of a car from $30 m / s$ to $40 m / s,$ if the mass of the car is $1000 k g$ is

The correct option is B $350 k J$
W.D = Change in K.E
$= \frac{1}{2} m (v^{2} - u^{2})$
$= \frac{1}{2} \times 1000 (40^{2} - 30^{2})$
$= \frac{1}{2} \times 1000 \times 700$
$= 350 k J$