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It is conservation of [angular] momentum.
That would probably depend on the specific situation; there are several equations that involve momentum. Two important equations are: 1) Conservation of momentum: m2 = m1 (i.e., total momentum after some event, such as an impact, is the same as total momentum before the event) 2) The definition of momentum: p = mv (momentum, which is usually written as "p", is mass times velocity) cw: Impulse (Force X time) is equal to the change in momentum.
by experimenting..
Calculus was invented to solve physics problems, so the importance of studying calculus is to solve physics problems.
There is no single method to solve all types of fraction problems. Some problems and their solutions are relatively simple, others are extremely difficult.