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Equations of Motion

A body of mas...

Question

A body of mass $1 k g$ , traveling with a velocity of $3 m / s$ , accelerates uniformly to acquire a velocity of $8 m / s$ in $2 s$ . Find the force acting on the body.

2 N

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2.5 N

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4 N

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5 N

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Solution

The correct option is B $2.5 N$
$F = m a = \frac{m (v - u)}{t}$
And putting the values of $m, u, v$ and $t$ from the question,

$F = \frac{1 (8 - 3)}{2} = 2.5 N$

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