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March 27, 2017

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A 20000 kg airplane takes off by traveling 300 m down a runway while the engines exert a continuous force of 4000 N.(a) Calculate the change in kinetic energy of the airplane during takeoff.(b) Determine the speed of the airplane as it leaves the runway.

  • physics - ,

    Work in = change in Ke = force * distance
    = 4000 * 300 = 12*10^5
    so
    (1/2)(2*10^5) v^2 = 12*10^5

    v^2 = 12
    v = 2 sqrt3

    4,000 N is not enough to get this plane off the ground.

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