Two rocks of masses 5kg and 10kg are dropped off a cliff at the same time.  1.  Which rock will hit the ground first? a)5kg rock b)10kg rock c) they will hit at the same time   Justify your answer.    2.  One of the rocks is now dropped from twice the original height (2H).  How does the time it takes to hit the ground (t2) compare to the original time (t1)? a) t2 = 2t1         b) t2 <2t1          c) t2 > 2t1   Justify your answer.

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Units and Dimensions

These are generally defined as the terms which precede or describes the dimensions further. These are also further divided into two parts namely fundamental units and the derived units.