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If two persons namely balram and ram,ram sat on a spaceship travel to another planent balram has been waiting for his friend on earth .after so many years

ram came to the earth.balram age was nearly 60 ,but ram age was nearly 18 ram age was constant compare to balram.why this happen occurs.
it is due to time dilation
the density of mercury is 13.6 g cm-3 in CGS system .find its value in SI units
and also if the person travel in space. he must travel with speed of light i.e 3*10^8 mt/s,then only the person age changes otherwise the age wii be constant


Its due to the time variation.the time goes a little wonky.every astronaut who spends in orbit is actually 0.000023 seconds.and thats the reason why he is aged 18
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The first reason is that on which planet he went that planet has less speed as compare to the earth and second reason is that on earth the gravitational force act on the body is more than any other planet.thus balram age was nearly 60 ,but ram age was nearly 18 ram age was constant compare to balram
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