Two point particles of mass m and 2m are initially separated by a distance 4a. They are then released to become free to move. Find the velocities of both the particles when the distance between them reduces to a.

Two particles of masses m and M are initially at rest at an infinite distance apart. They move towards each other and gain speeds due to gravitational attraction. Find their speeds when the separation between the masses becomes equal to d.

Two particles of masses m and M are initially at rest at an infinite distance part. They move towards each other and gain speeds due to gravitational attracton. Find their speeds when the separation between the masses becomes equal to d .

When the distanc ebetween the charged particles is halved the force between them becomes

.Two particles of masses "m_(1)" and m_(2)(m_(1)>m_(2))" are separated by a distance ' "d" '.The shift in the centre of mass when the two particles are interchanged.

Two particles of masses m_(1) and m_(2) (m_(1) gt m_(2)) are separated by a distance d. The shift in the centre of mass when the two particles are interchanged.

Two alpha particles are separated by a distance of 4 fermi (in air). Find the Columbian force between them.

Two charge each Q are released when the distance between is d .Then the velocity of each charge of mass m each when the distance between them is 2d is