[填空题]
Early test flights for the space*da)jw v+fk cusa).9l shuttle used a “glider” (mass of3t:578ucn eec: *dvkr, jbrx;qut ng5 980 kg including pilot) that was launched horizontally 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 absn;3 tquu*v5 k7e rc,r:5cbx:gd8 ent jence 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
