I dont understand how to solve this problem what is a keyconcept to understand?

Question

I dont understand how to solve this problem what is a keyconcept to understand? A key falls from a bridge that is 45m above water. it fallsdirectly into a model boat, moving with constant velocity, that is12m from the point of impact when the key is released. What is thespeed of the boat. I dont understand how to solve this problem what is a keyconcept to understand? A key falls from a bridge that is 45m above water. it fallsdirectly into a model boat, moving with constant velocity, that is12m from the point of impact when the key is released. What is thespeed of the boat.

Explanation / Answer

First, you need to find out how much time the key is in theair and you need to assume it has zero initial velocity since itwas dropped. y = vot +1/2gt2 t = (2y/g) = (2 *-45m/-9.8m/s2) = 3.03s Since the boat was moving at constant velocity and you knowthat the boat was 12m away when the key was initially dropped, younow know that it took the boat 3.03s to cover that distance. v = d/t = 12/3.03m = 3.96m/s t = (2y/g) = (2 *-45m/-9.8m/s2) = 3.03s Since the boat was moving at constant velocity and you knowthat the boat was 12m away when the key was initially dropped, younow know that it took the boat 3.03s to cover that distance. v = d/t = 12/3.03m = 3.96m/s

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