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A transport plane takes off from a level landing field withtwo gliders in tow, one behind the other. The mass of each glideris 700 kg, and the total resistance (air drag plusfriction with the runway) on each may be assumed constant and equalto 2500 N. The tension in the towrope between thetransport plane and the first glider is not to exceed 12000N.

1. If a speed of 40 m/s is required for takeoff, what minimum length of runway is needed?

(in m)

2. What is the tension in the towrope between the two gliderswhile they are accelerating for the takeoff?

(in N)

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