Suppose a car manufacturer tested its cars for front-end collisions by hauling them up on a crane

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Suppose a car manufacturer tested its cars for front-end collisions by hauling them up on a crane and dropping them from a certain height.
(a) Show that the speed just before a car hits the ground, after falling from rest a vertical distance H, is given by √2gH. What height corresponds to a collision at.
(b) 60 km/h?
(c) 100 km/h?
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