A car of $50 k g$ gets the speed of $10 m / s$ in $5$ second from zero velocity. Calculate the required force applied by the engine of the car:

250 N

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3 N

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50 N

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100 N

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Solution

The correct option is C $100 N$
Given : $m = 50$ kg $u = 0$ m/s $v = 10$ m/s $t = 5$ s
Using $v = u + a t$
$∴$ $10 = 0 + a (5)$ $⟹ a = 2$ $m / s^{2}$
Thus magnitude of force required $| F | = m | a | = 50 \times 2 = 100$ $N$

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