標題:
distance and displacement
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發問:
A jetliner, traveling northhhward, is landing with a speed of 61.5 m/s. Once the jet touches down, it has 781m of runway in which to reduce its speed to 14.8 m/s. Compute the average acceleration (magnitude and direction) of the plane during landing (take the dirction of the plane's motion as... 顯示更多 A jetliner, traveling northhhward, is landing with a speed of 61.5 m/s. Once the jet touches down, it has 781m of runway in which to reduce its speed to 14.8 m/s. Compute the average acceleration (magnitude and direction) of the plane during landing (take the dirction of the plane's motion as positive.) 其實唔係好明條問題, 即係有781M比佢DECELERATE到14.8M/S?? u=61.6, v=14.8, s=781???
最佳解答:
Use equation: v^2 = u^2 + 2as with v = 14.8 m/s, u = 61.5 m/s, s = 781 m, a =? Hence, 14.8^2 = 61.5^2 + 2a.(781) a = -2.28 m/s
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