Two stars each of mass `M` and radius `R` are approaching each other for a head-on collision. They start approaching each other when their separation is `rgt gtR`. If their speed at this separation are negligible, the speed `v` with which they collide would be

Two starts each of one solar mass (=2xx10^(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).

Two particles of mass m_(1) and m_(2) are approaching towards each other under their mutual gravitational field. If the speed of the particle is v, the speed of the center of mass of the system is equal to :

Two pulses on a string approach each other at speeds of 1m//s what is the shape of the string at t=6s?

Two particles of mass m and M are initially at rest and infinitely separated from each other. Due to mutual interaction, they approach each other. Their relative velocity of approach at a separation d between them, is

Two particles of mass m_(1) and m_(2) , approach each other due to their mutual gravitational attraction only. Then

Two spheres of masses 2M and M are initially at rest at a distance R apart. Due to mutual force of attraction, they approach each other. When they are at separation R//2 , the acceleration of the centre of mass of spheres would be

What will happen when two clouds with unlike charges approach each other?