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JEE Main 2008 (AIEEE) · Significant Figures & Order of Magnitude

Significant Figures & Order of Magnitude question from JEE Main 2008 (AIEEE)

Q14JEE Main 2008 · AIEEEEasy

Significant Figures & Order of Magnitude

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

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Answer: (a)

  1. p=mv=3.513×5.00=17.565 kg m s−1p = mv = 3.513 \times 5.00 = 17.565\ \text{kg m s}^{-1}
  2. 5.00 has 3 significant figures (the least), so round to 3.
  3. So the answer is (a) 17.6 kg m s−117.6\ \text{kg m s}^{-1}.
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