A new sprint track is being designed for competitions. If the 17 m radius curves are being designed to be perfectly banked for a runner pacing herself at 18 km/hr, at what angle should the track curves be banked

Question part points submissions used suppose that 2 j of work is needed to stretch a spring from its natural length of 26 cm to a length of 36 cm. (a) how much work is needed to stretch the spring from 28 cm to 32 cm? (round your answer to two decimal places.)