Two heavenly bodies `s_1 & s_2` not far off from each other, revolve in orbit

Two heavenly bodies S_1 and S_2 not far off from each other are seen to revolve in orbit

Two satellities s_(1) a & s_(2) of equal masses revolves in the same sense around a heavy planet in coplaner circular orbit of radii R & 4R

Two satellities s_(1) a & s_(2) of equal masses revolves in the same sense around a heavy planet in coplaner circular orbit of radii R & 4R

Two asteroids (heavenly bodies) of equal masses revolve diametricallly opposite to each other in a circle of radius 100 km. If mass of each astreroid is 10^(10) kg, then what would their velocites be (Take G = 6.67 xx 10^(-11) N m^(2) kg^(-2) ).

Two satellite S_1 and S_2 are orbiting around the earth in circular orbits in the same direction. Time period for the two satellite are 1h and 8h respectively. The radius of the orbit of satellite S_1 "is" 10^4km . If satellite S_1 and S_2 are on the same side of the earth, find the linear and angular speed of S_2 with respect to S_1 .

A stationary body of mass 3 kg explodes into three equal pieces.Two of the pieces fly off at right angles to each other, one with a velocity 2hati m//s and the other with a velocity 3hatj m//s .If the explosion takes place in 10 sec ,the average force acting on the third place in Newtons is: