Early test flights for the space shuttle used a "glider" (mass of 980 kg including pilot). After a horizontal launch at 480 kmh at a height of 3500 m, the glider eventually landed at a speed of 210 kmh. (a) What would its landing speed have been in the absence of air resistance? (b) What was the average force of air resistance exerted on it if it came in at a constant glide angle of 12° to the Earth’s surface?