Question 84

A spaceship travels at 810 km/hr. How many metres does it travel in 1/5th of a second?

Solution

Speed of spaceship = 810 km/hr

=> Speed in m/s = $$810 \times \frac{5}{18}$$

= $$5 \times 45 = 225$$ m/s

Thus, in 1 second, it travels 225 metres

$$\therefore$$ In $$\frac{1}{5}^{th}$$ of a second, it travels = $$\frac{225}{5}=45$$ m

=> Ans - (B)

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