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NEET 2009
Exam
NEET
Year
2009
Subject
Physics
Chapter
Motion in One Dimension

NEET 2009 · Physics · Motion in One Dimension

A bus is moving with a speed of 10 ~ms^ -1 on a straight road. A...

A bus is moving with a speed of 10 ms−110 \mathrm{~ms}^{-1} on a straight road. A scooterist wishes to overtake the bus in 100 s100 \mathrm{~s}. If the bus is at a distance of 1 km1 \mathrm{~km} from the scooterist, with what speed should the scooterist chase the bus ?

Options

  1. A10 ms−110 \mathrm{~ms}^{-1}
  2. B20 ms−120 \mathrm{~ms}^{-1}
  3. C40 ms−140 \mathrm{~ms}^{-1}
  4. D25 ms−125 \mathrm{~ms}^{-1}

Correct answer

B. 20 ms−120 \mathrm{~ms}^{-1}

Step-by-step solution

Sr=vrt1000=(v−10)×100v=20m/s\begin{aligned}\mathrm{S}_{\mathrm{r}}& =\mathrm{v}_{\mathrm{r}} \mathrm{t}\\ 1000 & =(\mathrm{v}-10) \times100 \\ \mathrm{v}& =20 \mathrm{ m}/ \mathrm{s} \end{aligned}$$
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