During a violent thunderstorm, hail of diameter 1.0 cm falls directly downward at speed of 25m/s. There are estimated to be 120 hailstones per cubic meter of air. (a) What is the mass of each hailstone (density = 0.92 g/cm^3)? (b) Assuming that the hail does not bounce, find the magnitude of the average force on a flat roof measuring 10m x 20m due to the impact of the hail.
Hint: during impact the force on a hailstone from the roof is approximately equal to the net force on the hailstone because the gravitational force on it is small.
Mass/ Volume = Density
The answer with good explanations.