Differences in analysing a roller coaster system as, Ask an Expert

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Q1. Differences in analysing a roller coaster system as particle and rigid body, such as the assumption(s) made when treating the roller coaster as particle, parameters involved in kinematic and kinetic analysis.

Q2. During a violent thunderstorm, hail the size of marbles (diameter = 1.60 cm) falls at a speed of 36 m/s. There are estimated to be 50 hailstones per cubic meter of air. Suppose that, as for ice, 1.00 cm3 of hail has a mass of 0.91 g. What is the mass of each hailstone?

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