Speed, Distance & Time: Relative Speed, Trains, Boats & Circular Tracks
Master unit conversions, relative velocity when objects move in opposite/same directions, upstream/downstream mechanics, and race problems.
- Speed conversion: Multiply by 5/18 for km/h to m/s; multiply by 18/5 for m/s to km/h.
- Relative Speed: Add speeds when moving in opposite directions; subtract when moving in the same direction.
- Downstream Speed = Speed of Boat + Speed of Stream; Upstream = Boat - Stream.
Simplifying Relative Motion
Speed-Distance-Time problems become transparent once you standardize your unit dimensions from the opening line and identify whether motion is additive or subtractive.
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