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The pilot of an airplane traveling 190 km/h wants to drop supplies to flood victims isolated on a patch of land 100 m below.
How many seconds before the plane is directly overhead should the supplies be dropped? ...?

Respuesta :

All we need to calculate is the time it takes for the supplies to fall from the plane to the ground. Using the free-falling body equation,

y = -1/2*gt^2 + y00 = -1/2*9.80*t^2 + 100t = 4.52 s.

The supplies should be dropped 4.52 s before the plane is directly overhead.

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