The distances travelled by a body starting from rest and travelling with uniform acceleration in successive…

The distances travelled by a body starting from rest and travelling with uniform acceleration in successive intervals of time each of one second will be in the ratio:
  1. \(1: 2: 3\)
  2. \(1: 2: 4\)
  3. \(1: 3: 5\)
  4. \(1: 5: 9\)

Solution

Distance traveled (s) is given by: \(\mathrm{s}=\mathrm{ut}+\frac{1}{2} \mathrm{at}^{2}\) Now, interval wise distance traveled are: \(\mathrm{s}_{1}-\mathrm{s}_{0}=\frac{\mathrm{a}}{2}(1)^{2}=\frac{\mathrm{a}}{2}\) \(s_{2}-s_{1}=\frac{a}{2}(2)^{2}-\frac{a}{2}(1)^{2}=\frac{3 a}{2}\) \(\mathrm{s}_{3}-\mathrm{s}_{2}=\frac{\mathrm{a}}{2}(3)^{2}-\frac{\mathrm{a}}{2}(2)^{2}=\frac{5 \mathrm{a}}{2}\) Hence, its in the ratio \(=\frac{\mathrm{a}}{2}: \frac{3 \mathrm{a}}{2}: \frac{5 \mathrm{a}}{2}=1: 3: 5\) /

Asked in: JEE Mains - Motion In One Dimension - Test 2

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