A cyclist turns around a curve at 15 miles per hour. If he turns at double the speed, the tendency of overturn is
doubled
quadrupled
halved
unchanged
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A fighter aeroplane flying in the sky dives with a speed of 360 km/hr in a vertical circle of radius 200 m. Weight of the pilot sitting in it is 75 kg. What will be the value of force with which the pilot presses his seat when the aeroplane is at highest position (g = 10 m/s2)