A car travels 54 km/h for …
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Sia ? 6 years, 6 months ago
Conversion:
54 km/hr = 54 {tex}\times \frac{5}{18}{/tex} = 15 m/s
36 km/hr = 36 {tex}\times \frac{5}{18}{/tex} = 10 m/s
18 km/hr = 18 {tex}\times \frac{5}{18}{/tex} = 5 m/s
Now, First,
Speed = 15 m/s and Time = 20 s
Distance = Speed x Time = 15 x 20 = 300 m
Second,
Speed = 10 m/s and Time = 30 s
Distance = 10 x 30 = 300 m
Third,
Speed = 5 m/s and Time = 10 s
Distance = 5 x 10 = 50 m
Now Total Distance = 300 + 300 + 50 = 650 m
Total time = 20 + 30 + 10 = 60 s
Therefore, Average Speed = {tex}\frac{650}{60} = \frac{65}{6}{/tex} m/s
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