The pilot of a spacecraft moving horizontally at 10 m/s notices that the hailstones going past the port window makes an angle of 45* with the downward vertical. What is the speed of the hailstones with respect to the ground, assuming that there is no wind? Select one: a. 10 m/s Ob. 14 m/s O c. 20 m/s O d. 21 m /s The correct answer is: 10 m/s