An object moving with speed $2 m / s$ strikes a wall and moves back along the same line with same speed. The magnitude of change in velocity of the object is

0

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4 m / s

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2 m / s

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6 m / s

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Solution

The correct option is B $4 m / s$
Given,
$\to u = (2^i) m / s$
$\to v = (- 2^i) m / s$
Change in velocity of the object is
$Δ \to v = \to v - \to u$
$Δ \to v = - 2^i - 2^i = - 4^i$
The magnitude of change in velocity of the object is,
$| Δ \to v | = \sqrt{(- 4)^{2}} = 4 m / s$
The correct option is B.

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An object moving with speed 2 m/s strikes a wall and moves back along the same line with same speed. The magnitude of change in velocity of the object is

The correct option is B 4 m/sGiven,→u=(2^i)m/s→v=(−2^i)m/sChange in velocity of the object isΔ→v=→v−→uΔ→v=−2^i−2^i=−4^iThe magnitude of change in velocity of the object is,|Δ→v|=√(−4)2=4m/sThe correct option is B.

An object moving with speed $2 m / s$ strikes a wall and moves back along the same line with same speed. The magnitude of change in velocity of the object is