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E-3.a During a heavy rain, hailstones of average size 1.0 cm in diameter fall with an average speed of 20 mis.Suppose 2000 hailstones strike every square meter of a 10 m x 10 m roof perpendicularly in onesecond and assume that the hailstones do not rebound. Calculate the average force exerted by thefalling hailstones on the roof. Density of hailstones is 900 kg/m, take (3.14)

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