Homework Help: Physics

Posted by Anonymous on Thursday, February 2, 2012 at 9:54pm.

A ball is thrown horizontally from the top of a building 21.6 m high. The ball strikes the ground at a point 123 m from the base of the building. Find the x component of its velocity just before it strikes the ground. Find the y component of its velocity just before it strikes the ground.

Physics - drwls, Friday, February 3, 2012 at 8:19am
Compute how long it takes to fall 21.6 m. Call that time T. You should know that formula.
If not, derive it from
H = 123 m = (g/2) T^2.
The vertical velocity when it hits ground is g*T.
The horizontal velocity remains 123 m/T during flight.

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