Question

The minimum distance between earth and mars is 5.46x10^7 km
This distance will occur in the year 2287
In 2287 if we send a signal to mars which travels at 3x10^5 km per second,
How many seconds will it take to travel to mars?

Answer 1

Given :-

• Distance between Mars & Earth = $\sf5.46\times\ 10^{7}km$

• Speed of the signal send by us = $\sf3\times\ 10^{5}km/s$

To Find :-

• Time to travel to Mars

Answer :-

• 182 Seconds

Concept Used :-

$\bf{\boxed{\boxed{Time \:=\:\dfrac{Distance}{Speed}}}}$

Explanation :-

$\implies\sf{Time = \dfrac{Distance}{Speed}}$

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$\implies\sf{Time = \dfrac{5.46\times\ 10^{7}}{3\times\ 10^{5}}}$

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$\implies\sf{Time = \dfrac{\cancel{5.46}\times\cancel{\ 10^{5}}\times\ 10^{2}}{\cancel{3}\times\cancel{\ 10^{5}}}}$

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$\implies\sf{Time = 1.82\times\ 10^{2}sec.}$

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$\sf{\boxed{\boxed{\green{\dag{Time = 182sec.}}}}}$

$\bf{\underline{So\:Time \:taken \:by \:signal\:is\:182\:sec.}}$

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• Speed and distance are scaler quantity , means these have only magnitude but no direction

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• Unit of speed is km/hr OR m/sec.

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• Speed and Motion are of two types :-

1. Uniform
2. Non-Uniform

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• Here time will be in second because

Time = $\sf{\dfrac{Distance}{Time}=\dfrac{km/s}{km}=\dfrac{\cancel{km}/s}{\cancel{km}}= s}$

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