Physics, asked by mm2704744, 1 month ago

people are saying gravity will increase object speed but as we all know that light is constant! how can u increase its speed if it's a constant? will u break law of light!


Imagine if from a tower two same type of substance is thrown down everything is same mass,height everything
and if one object fall down at normal spedd of 20 km/hr and second object if falls at light speed so whether the gravity will act on second object or not?
I mean light speed is constant so whether it will increase the speed of object or not?
please explain how​​

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Answered by aspit
1
According to Newton’s universal law of gravitation gravitational force= GMm/r^2 where G is gravitational constant, M and m are the mass of 2 bodies between which the force is observed, and r is the distance between the bodies, so if we use this equation for finding the gravitational force between light and earth, we know that light’s mass is 0 i.e. it’s massless so , gravitational force= GM(0)/r^2 = 0 , so we can see that gravitational force acts only on the object which has mass and light doesn’t, so gravitational force doesn’t act on it. So it’s speed remains constant!! (This answer is given according to Newtonian mechanics and relativity is not taken into consideration)
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