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Question

(1) An object moves 18 m the in first 3 second and 22 m in the next 3 second while it travels 14 m in the last 3 second. Calculate average speed. [Ans = 6 m/s]

(2) A person travels a distance of 72 km in 4 hours. Calculate average speed in m/s.

[Ans = 5 m/s]

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Solution

(1) Given that,

Distance, d1 = 18 m in time t1 = 3 s

Also, d2 = 22 m in time t2 = 3s

d3 = 14 m t3 = 3 s

Total distance, d = d1 + d2 + d3 = 18 + 22 + 14 = 54

Time taken, t = t1 + t2 + t3= 3 +3 +3 3 = 9 s

= …….?

(2) Given that,

Total distance, d = 72km = 72000 m

Time taken, t = 4 hours = 4×3600 s

= …….?


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