Two masses `M_1 and M_2` separated by distance r start moving towards each other due to their own force of attraction. What will be the change in centre of mass?

If the distance between two bodies of mass 200 kg each is 3 meters, what is the force of gravitation between them?

Two charged particles are separated by a distance 1 cm. What is the minimum possible electric force acting on each charge ?

The masses of two bodies are m_1 and m_2 the distance between them is d. What is the gravitational force between them?

Two bodies whose masses are m_1 = 50 kg and m_2 150g are tight by a string and placed in a horizontal surface. When m_1 is pulled by a force F and acceleration of 5ms^-2 is produced in both the bodies. Calculate the value of F and tension in the strong.

Two particles, each of mass m and speed v_3 travel in opposite directions along parallel lines separated by a distance d. Show that the vector angular momentum of the two particle system is the same whatever be the point about which the angular momentum is taken.

(Attempt any ten of the following questions) Define one coulomb charge. Two point charges at a distance r in air exert a force F on each other. At what distance will these charges experience the same force F in a medium of dielectric constant k?