Distance = Speed × Time
e.g., A walks at 1m/s for 10 sec. Distance traveled = 1 ?10 = 10m
Average Speed
E.g. A person travels from A to B at a speed of 40 mph and returns at
60 mph Average speed for journey
| Average Speed = |
 |
Relative Speed
Case I
A →
10mph
|---------------------------------------------|
B → 5mph
If A and B are moving in the
opposite direction i.e. towards each other. A would take less time to
cross B than if B were stationary. This because B is making it easier
by moving towards A.
Case II
A →
8mph
|---------------------------------------------|
B → 5mph
If A
and B are moving in the same direction, it would take more time for A to
overtake B, because B is moving away from A.
In Case
I the relative speed of A wrt B = 10 + 5 = 15mph
In Case II the
relative speed of A wrt B = 8 - 5 = 3mph
|
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