Question 6.Why does a ball dropped from a certain height not bounce back 1 point to the same height it was dropped from? *

Because the coefficient of restitution is less than 1.

This coefficient is 1 for a perfectly elastic collision.

Some of the energy of the fall is absorbed by the ball so the ball cannot return to its original height.

Also, you have the effects of air resistance and some energy absorption of the the reflecting surface.

Simply answer is to To precisely pinpoint its position, GPS must track four satellites. Four satellites are required because the receiver must determine its position (latitude, longitude, altitude) and correct its clock error.

Explanation: