[" Two spherical asteroids have "],[" the same radius "R" .Asteroid "1],[" has mass "M" and asteroid "2" has "],[" mass "2M" .The two asteroids are "],[" released from rest with distance "],[" 10R between their centers.What "],[" is the relative speed of approach "],[" just before they collide? "]

Two points mass m and 2m are kept at a distance a . Find the speed of particles and their relative velocity of approach when separation becomes a//2 .

Two smooth spherical non-conducting shells A and B each of radius R ,having uniformly distributed charge Q and -Q on their surfaces are released from rest on a smooth non- conducting surface,when distance between their centre is 10R.The mass of A is m and that of B is 2m .What is the speed of A just before it collides with B?

[" An asteroid is moving directly "],[" towards the centre of the earth."],[" When at a distance of "10R" ( "R" is the "],[" radius of the earth) from the earths "],[" centre,it has a speed of "12km/s" ."],[" Neglecting the effect of earths "],[" atmosphere,what will be the speed "],[" of the asteroid when it hits the "],[" surface of the earth (escape velocity "],[" from the earth is "11.2km/s" ).Give "],[" your answer to the nearest integer in "],[km/s" ................"]

A thin spherical shell of mass M and radius R has a small hole. A particle of mass m released at its mouth. Then

If the masses are released from the position shown in figure then the speed of mass m1 just before it strikes the floor is -

Two masses m_(1) and m_(2)(m_(1)ltm_(2)) are released from rest finite distance. They start under their mutual gravitational attraction-

A solid sphere of mass M and radius R is surrounded by a spherical shell of same mass and radius 2R as shown. A small particle of mass m is relased from rest from a height h (lt lt R) above the shell. There is a hole in the shell. Q. With what approximate speed will it collide at B?