During a violent thunderstorm, hail the size of marbles (diameter = 2.10 cm) falls at a speed of 37.0 m/s. There are estimated to be 175.0 hailstones per cubic meter of air. Assume that, as for ice, 1.00 cm³ of hail has a mass of 0.920 g.
A) What is the mass of each hailstone?
B) What is the magnitude of the force exerted by the hail on a 10.00 x 21.00 m flat roof during the storm? Ignore the bounce of the hail on impact.