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Second Law of Motion

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Question

Starting from rest, how long does it take the airboat to reach a speed of 12.0 m/s?

A

5.45 s

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B

6 s

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C

6.5 s

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D

4.45 s

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Solution

The correct option is A 5.45 s
$m a s s m = 350 k g, f o r c e F = 770 N, t i m e t = ?, v = 12 m / s$
We know,
$F = m a = \frac{m (v - u)}{t}, u = 0$
$770 = \frac{350 \times 12}{t}$
$t = \frac{4200}{770}$
$t = 5.45 s$

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