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Question

Convert the following speeds into $$m/sec:$$
$$72\ km/h$$

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Solution

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$$72\ km/h$$
$$1\ km=1000\ m$$
and $$1\ h=3600\ sec$$
$$\dfrac{1\ km}{h}=\dfrac{1000}{3600}=\dfrac{5}{18}\ m/s$$
$$\therefore 72\ km/h=\dfrac{5}{18} \times 72\ m/sec$$
$$=20\ m/sec$$

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