[填空题]
Early test flights for the space shuttle use1bw gtx0a-yg 8o/2ac yd a “g qm3hze0f (7ry+2h)o:j rh -zokyn m7llider” (mass of 980 kg including pilot) that was launched horiz2rqryomz0hey7m )(-f+z:nh 73 jh l koontally at 500km/h from a height of 3500 m. The glider eventually landed at a speed of 200km/h (a) What would its landing speed have been in the absence of air resistance?$\approx$ km/h
(b) What was the average force of air resistance exerted on it if it came in at a constant glide of 10 $^{\circ} $ to the Earth?$\approx$ N
