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Two stars each of one solar mass (= 2 × ...

Two stars each of one solar mass `(= 2 × 10^(30) kg) `are approaching each other for a head on collision. When they are a distance `10^(9)` km, their speeds are negligible. What is the speed with which they collide ? The radius of each star is `10^(4)` km. Assume the stars to remain undistorted until they collide. (Use the known value of G).

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`2.6 xx 10^(6)` m/s
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  18. A satellite orbits the earth at a height of 400 km above the surface. ...

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