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Standard VIII

Physics

Time and Speed

The average s...

Question

The average speed of a bicycle, an athlete and a car are $18 k m p h$ , $7 m s^{- 1}$ and $2 k m m i n^{- 1}$ respectively. Which of the three is the fastest and which is the lowest? [2 MARKS]

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Solution

Conversion in 1st case: 1 Mark
Conversion in 3rd case: 1 Mark

Let us convert the three given speeds into S.I. unit i.e. $m s^{- 1}$ , so that we can compare them.

In the case of:
(i) Speed of the bicycle $= 18 k m p h = 18 \times \frac{5}{18} = 5 m s^{- 1}$
(ii) Speed of the athelete $= 7 m s^{- 1}$
(iii) Speed of the car $= 2 k m m i n^{- 1} = 2 \times \frac{1000}{60} = 33.3 m s^{- 1}$

So, the car is the fastest and the bicycle is the slowest.

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The average speed of a bicycle, an athlete and a car are 18 kmph, 7 ms−1 and 2 km min−1 respectively. Which of the three is the fastest and which is the lowest? [2 MARKS]

The average speed of a bicycle, an athlete and a car are $18 k m p h$ , $7 m s^{- 1}$ and $2 k m m i n^{- 1}$ respectively. Which of the three is the fastest and which is the lowest? [2 MARKS]