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Two states each of one solar mass (2xx10...

Two states each of one solar mass `(2xx10^(30)kg)` are approaching each other for a head on collision. When they are at a distance `10^(9)` their speeds are negotiable. What is the speed with which they collide ? The radius of each star is `10^(4)` assume the stars to remain undistorted unit thye collide.

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