Question

a body moves with 54 km per hour for 5 second then next 5 second with speed 36 km per hour the average speed of the body is? a) 10m/s b) 60m/s c) 12.5m/s d) 30m/s​

Answer 1

So I have tried my best to find ur answer and the correct option for this answer is option C. 12.5m/s

Answer 2

Solution :-

→ S1 = 54 km/h = 54 * (5/18) = 15 m/s

→ T1 = 5 seconds

so,

→ Distance = Speed * Time

→ D1 = S1 * T1

→ D1 = 15 * 5

→ D1 = 75 m

now,

→ S2 = 36 km/h = 36 * (5/18) = 10 m/s

→ T2 = 5 seconds

so,

→ Distance = Speed * Time

→ D2 = S2 * T2

→ D2 = 10 * 5

→ D2 = 50 m

then,

→ Average speed = Total distance covered / Total time taken

→ Average speed = (D1 + D2) / (T1 + T2)

→ Average speed = (75 + 50) / (5 + 5)

→ Average speed = 125/10

→ Average speed = 12.5 m/s (C) (Ans.)

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