Question

two balls P and Q having masses 2Kg and 4kg respective are dropped from the same height simultaneously. Show that they will reach the ground simultaneously

Answer 1

Solution : Since we know that,

F = GMm/R²

And F = mg

mg = GMm/R²

g = GM/R²

For Earth, M = 6 × 10²⁴ and R = 6.4 × 10^6.

g = ( 6.67 × 10^(-11) × 6 × 10²⁴ )/[ 6.4 × 10^6 ]²

g = 9.8 m/s²

This means that two balls P and Q irrespective of their different masses will come simultaneously to ground because of same accelerations ( 9.8 m/s² ) exerted on them.