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A ball A’ of mass m falls to the surface of the earth from infinity.Another ball ‘B’ of mass 2m falls to the earth from the height equal to six times the radius of the earth then the ratio of velocities of ‘A’ and ‘B’ on reaching the earth is what?

A ball A’ of mass m falls to the surface of the earth from infinity.Another ball ‘B’ of mass 2m falls to the earth from the height equal to six times the radius of the earth then the ratio of velocities of ‘A’ and ‘B’ on reaching the earth is what?

Grade:11

2 Answers

raj
16 Points
7 years ago
in first case, initial pe=0 and final pe is GmM/r..conserve energy here and get val of 1/2mv^2
in second case, initial pe is GmM/7r and final pe is GmM/r..again conserve energy to get val of k.e.
find ratio of vel. now..
raj
16 Points
7 years ago
sorry, in second case take 2m everywhere in place of m

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