EXERCISE 1) Show on the basis of dimensional analysis that the following relations are
correct:
a. p = 3g/4G where p is the density of earth, G is the gravitational
constant, r is the radius of the earth and g is acceleration due to gravity.
2) The speed of sound v in a medium depends on its wavelength 1, the young
modulusE, and the density p, of the medium. Use the method of dimensional
analysis to derive a formula for the speed of sound in a medium. (Unit for
Young Modulus E: kgm's 2)
TOO​

Is a  vector quantity  that refers to "the rate at which an object changes its position." imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. while this might result in a frenzy of activity, it would result in a zero velocity. because the person always returns to the original position, the motion would never result in a change in position. since velocity is defined as the rate at which the position changes, this motion results in zero velocity. if a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. every step must go into moving that person further from where he or she started. for certain, the person should never change directions and begin to return to the starting position.

The objects do not reach terminal velocity         there is not enough time from the time the object falls from when it hits the ground to achieve terminal velocity. an object must be placed higher to achieve terminal velocity in order to be in free fall.