# physics

a ball is thrown horizontally from the top of a building 35m. high. the ball strikes the ground at a point 80m from the base of the building.

a. find the time the ball is in flight
b. its initial velocity
c. the x and y components of velocity just before it hits the ground

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1. 12

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2. a. = h = 0.5g*t^2 = 35 m.
4.9t^2 = 35.
t^2 = 7.14
t = 2.67 s. Time in flight.

b. Range = Xo*t = 80 m.
Xo*2.67 = 80.
Xo = 30.0 m/s.

c. Y^2 = Yo^2 + 2g*h = 0 + 19.6*35 =
686.
Y = 26.2 m/s.
X = Xo = 30.0 m/s.

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3. Philip jumps horizontally from the top of a building that is twenty and a half meters high. He hopes to reach a swimming pool that is at the bottom of the building, fourteen meters horizontally from the edge of the building. To make it to the pool:

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