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An airplane taking off from a landing field has run of 400 m. If it starts from rest and accelerates its motion uniformly and makes the run in 20 seconds. with what velocity did it take off

  • physics -

    average speed = 400/20 = 20 m/s^2
    constant acceleration (v = a t + starting speed) so begin speed is 0 and end speed is 40 m/s

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