a) [latex] 10 frac{m}{s} = frac {10 cdot frac{1}{1000} km}{1 cdot frac{1}{3600}h} = frac{10}{1000}cdot 3600 = frac {36000}{1000} = 36 frac{km}{h} [/latex] [latex] 20 frac{m}{s} = frac {20 cdot frac{1}{1000} km}{1 cdot frac{1}{3600}h} = frac{20}{1000}cdot 3600 = frac {72000}{1000} = 72 frac{km}{h} [/latex] [latex]45 frac{m}{s} = frac {45 cdot frac{1}{1000} km}{1 cdot frac{1}{3600}h} = frac{45}{1000}cdot 3600 = frac {162000}{1000} = 162 frac{km}{h}[/latex] [latex]340 frac{m}{s} = frac {340 cdot frac{1}{1000} km}{1 cdot frac{1}{3600}h} = frac{340}{1000}cdot 3600 = frac {1224000}{1000} = 1224 frac{km}{h}[/latex] b) [latex]18 frac{km}{h} = frac{18 cdot 1000 m}{3600s}=frac{18000}{3600}=5frac{m}s}[/latex] [latex]54 frac{km}{h} = frac{54 cdot 1000 m}{3600s}=frac{194400}{3600}=54frac{m}s}[/latex] [latex]90 frac{km}{h} = frac{90 cdot 1000 m}{3600s}=frac{90000}{3600}=25frac{m}s}[/latex] [latex]108 frac{km}{h} = frac{108 cdot 1000 m}{3600s}=frac{108000}{3600}=30frac{m}s}[/latex]
10 m/s =10 * 3,6 km/h = 36 km/h 20 m/s=20*3,6 km/h = 72 km/h 45 m/s =45*3,6 km/h= 162 km/h 340 m/s = 340*3,6 km/h=1224 km/h 18 km/h = 18*(10/36)m/s=5 m/s 54 km/h= 54*(10/36) m/s = 15m/s 90 km/h=90*(10/36)m/s=25m/s 108 km/h = 108 *(10/36)m/s=30m/s
