# physics

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The pilot of an airplane traveling 240 km/h wants to drop supplies to flood victims isolated on a patch of land 160 m below. The supplies should be dropped how many seconds before the plane is directly overhead?

• physics -

What time does it take for an object to fall 160m?

• physics -

160 = .5gt^2

= 5.7s

• physics -

The cliff divers of Acapulco push off horizontally from rock platforms about 30.6 m above the water, but they must clear rocky outcrops at water level that extend out into the water 5.0 m from the base of the cliff directly under their launch point. See the figure. What minimum pushoff speed is necessary to clear the rocks? (m/s)

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