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An aeroplane accelerated from rest and lifts off the ground with a speed of 200km/h after travelling a distance of 1000m on the runway. Find the average acceleration of the aeroplane.咁我就咁計啦...v^2 = u^2 +2as如果一開始轉200km/h做55/5/9 m/s 既話就係(55/5/9)^2 = 0^2 + 2000aa= 1/44/81 m/s^2但如果就咁比佢用200km/h黎計就係(200)^2 =... 顯示更多 An aeroplane accelerated from rest and lifts off the ground with a speed of 200km/h after travelling a distance of 1000m on the runway. Find the average acceleration of the aeroplane. 咁我就咁計啦... v^2 = u^2 +2as 如果一開始轉200km/h做55/5/9 m/s 既話 就係 (55/5/9)^2 = 0^2 + 2000a a= 1/44/81 m/s^2 但如果就咁比佢用200km/h黎計 就係 (200)^2 = 0^2 + 2a a= 20000 km/h^2 兩個答案唔同...conversion方面有咩錯左??
最佳解答:
They are the same. 200 km/h = 55.56 m/s hence, 55.56^2 = 2 x 1000a where a is the acceleration of the aeriplane i.e. a = 1.543 m/s^2 or a = 1.543/1000 km/s^2 = 1.543x10^-3 km/s^2 = (1.543x10^-3) x3600^2 km/h^2 = 20 000 km/h^2 If using (km/h) as the unit for velocity 200^2 = 2 x 1a i.e. a = 20,000 km/h^2
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physics acceleration concept不清發問:
An aeroplane accelerated from rest and lifts off the ground with a speed of 200km/h after travelling a distance of 1000m on the runway. Find the average acceleration of the aeroplane.咁我就咁計啦...v^2 = u^2 +2as如果一開始轉200km/h做55/5/9 m/s 既話就係(55/5/9)^2 = 0^2 + 2000aa= 1/44/81 m/s^2但如果就咁比佢用200km/h黎計就係(200)^2 =... 顯示更多 An aeroplane accelerated from rest and lifts off the ground with a speed of 200km/h after travelling a distance of 1000m on the runway. Find the average acceleration of the aeroplane. 咁我就咁計啦... v^2 = u^2 +2as 如果一開始轉200km/h做55/5/9 m/s 既話 就係 (55/5/9)^2 = 0^2 + 2000a a= 1/44/81 m/s^2 但如果就咁比佢用200km/h黎計 就係 (200)^2 = 0^2 + 2a a= 20000 km/h^2 兩個答案唔同...conversion方面有咩錯左??
最佳解答:
They are the same. 200 km/h = 55.56 m/s hence, 55.56^2 = 2 x 1000a where a is the acceleration of the aeriplane i.e. a = 1.543 m/s^2 or a = 1.543/1000 km/s^2 = 1.543x10^-3 km/s^2 = (1.543x10^-3) x3600^2 km/h^2 = 20 000 km/h^2 If using (km/h) as the unit for velocity 200^2 = 2 x 1a i.e. a = 20,000 km/h^2
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