Answer to Question #194534 in Mechanical Engineering for Hagos

Question #194534

An aircraft touches down at a speed of 200 km/hour and the brakes are applied. If the aircraft deceleration is given by π‘Ž = βˆ’0.05 𝑣 (using units of metres and seconds), how far will it have travelled along the runway by the time its speed drops to 20 km/hour? 


1
Expert's answer
2021-05-18T17:20:02-0400
a=βˆ’kvvβˆ’v0=βˆ’kL20βˆ’200=βˆ’(3.6)(0.05)LL=1000 m=1 kma=-kv\\v-v_0=-kL\\\\20-200=-(3.6)(0.05)L\\L=1000\ m=1\ km


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