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Question
A racehorse runs straight towards the north and covers 540 m in one minute. Calculate
- displacement of the horse,
- its velocity in (a) ms−1 (b) kmh−1.
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Solution
A racehorse runs straight towards the north and covers 540 m in one minute.
(i) Displacement = 540 m − north
(ii) Time = 1 minute = 60 s
Velocity = `"Displacement"/"Time"`
v = `540/60` = 9 ms−1
v = `(9xx3600)/100` km/h = `324/10` km/h
v = 32.4 km/h or kmh−1
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