Question

state the S.I. unit of speed. a girl moves with the speed of 6km/h for 2h and with the speed of 4km/h for next 3 h.find the average speed of the girl and total distance moved.

Answer 1

S.I Unit of Speed -- meter/second ( m/s)

1st Case --
Speed = 6 km/h
Time taken = 2 hour

Distance = Speed x Time = 6 x 2 = 12 km

2nd Case --
Speed = 4 km/h
Time taken = 3 hour

Distance = 4 x 3 = 12 km

Total distance = 12 + 12 = 24 km
Total time = 3 + 2 = 5 hours
Average speed = Total distance/ Total time = 24/5 = 4.8 km/h = 1.33 m/s

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Answer 2

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