A body has an initial velocity of 4 $m s^{- 1}$ and deceleration of 4 $m s^{- 2}$ , then what is its final velocity after traveling 2m?

4 $m s^{- 1}$

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0 $m s^{- 1}$

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5.656 $m s^{- 1}$

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2 $m s^{- 1}$

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Solution

The correct option is B
0 $m s^{- 1}$

Initial velocity u = 4 $m s^{- 1}$ , acceleration a = -4 $m s^{- 2}$ and distance travelled s = 2m and final velocity v

Using equation of motion,

$v^{2} = u^{2} + 2 a s$ ,

$v^{2} = 4^{2} + 2 \times - 4 \times 2$ ,

$v^{2} = 16 - 16$ ,

So v = 0

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