An object gets $20$ second to increase the speed from $10 m / s$ to $50 m / s$ . If the mass of the object is $1000 k g$ , what force will be required to do so?

20 N

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15 N

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10.5 N

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2000 N

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Solution

The correct option is C $2000 N$
Given : $m = 1000$ kg $u = 10$ m/s $v = 50$ m/s $t = 20$ s
Using $v = u + a t$
$∴$ $50 = 10 + a (20)$ $⟹ a = 2$ $m / s^{2}$
Thus force required $F = m a = 1000 \times 2 = 2000$ $N$

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