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The speed of an airplane is 216KM / h when it lands. After landing, it moves in a straight line with an acceleration of 6m / S ^ 2 The speed of an aircraft when landing is 216KM / h. After landing, it will make a uniform deceleration linear motion with an acceleration of 6m / S ^ 2. (1) the speed when it taxis 225m after landing, and the displacement when it taxis within 12s after landing
one
v0=216km/h=60m/s
2as=v0^2-v1^2
v1^2=v0^2-2as=3600-2x6x225=900
v1=30m/s
two
V2 = V0 at = 60-6x12 = - 12 has stopped
V stop = 60 △ 6 = 10s
s＝1/2at^2=1/2x6x10^2=300m
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