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Standard XII

Physics

Significant Figures in Sum

A body of mas...

Question

A body of mass $m = 3.513 k g$ is moving along the x-axis with a speed of $5.00 {m s}^{- 1}$ . The magnitude of its momentum is recorded as :

17.56 k g {m s}^{- 1}

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17.57 k g {m s}^{- 1}

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17.6 k g {m s}^{- 1}

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17.565 k g {m s}^{- 1}

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Solution

The correct option is C $17.6 k g {m s}^{- 1}$
Momentum $= m v = 3.513 \times 5.00 = 17.565 \approx 17.57$
$\approx 17.6 k g m / s$
(Since 5.00 contains least no. of significant figures i.e. 3)

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A body of mass m=3.513 kg is moving along the x-axis with a speed of 5.00ms−1. The magnitude of its momentum is recorded as :

The correct option is C 17.6 kgms−1Momentum=mv=3.513×5.00=17.565≈17.57≈17.6kgm/s(Since 5.00 contains least no. of significant figures i.e. 3)

A body of mass $m = 3.513 k g$ is moving along the x-axis with a speed of $5.00 {m s}^{- 1}$ . The magnitude of its momentum is recorded as :

The correct option is C $17.6 k g {m s}^{- 1}$
Momentum $= m v = 3.513 \times 5.00 = 17.565 \approx 17.57$
$\approx 17.6 k g m / s$
(Since 5.00 contains least no. of significant figures i.e. 3)