Speed OF Separation, Speed OF Approach || Maximum and Mimimum Distance

The speed of sound is maximum in

Speed of earth is maximum at :-

Speed of light is maximum in

When the speed of a car is u , the mimimum distance over which it canbe stopped is a , If speed becomes nu , what will be the mimimum distance over which it can be stopped during the same time?

Maximum speed of a protist is

Assertion : In case of elastic collision between two objects , speed of approach is same as speed of separation . Reason : In case of elastic collision between two objects , linear momentum of the system remains conserved .

A charge particle 'q' is shot towards another charged particle 'Q' which is fixed, with a speed 'v'. It approaches 'Q' upto a closest distance r and then returns. If q were given a speed of '2v' the closest distances of approach would be

A charged particle q is shot from a large distance twoards another charged particle Q which is fixed, with speed v. It approaches Q up to as closed distance r and then returns. If q were given a speed 2v, the distasnce of approach would be