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# Physics 2D

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A ball is thrown horizontally from the top of a building 36.7 m high. The ball strikes the ground at a point 91.9 m from the base of the building. Find the y component of its velocity just before it strikes the ground.

Oct 29, 2019

#1
+21753
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Thrown horizontally....how long before it his the ground?

x = x0 + vi t+ 1/2 a t2     x = 0     xo = 36.7 m   vi =0   a = -9.81 m/s2

0=36.7 + 1/2 (-9.81) t2         solve for t = 2.735 seconds

vf = vo + at

vf = 0 -9.81(2.735) = -26.83 m/s   (negative because it is in downward direction)    if ya just want the magnitude: 26.83 m/s

Oct 29, 2019

#1
+21753
0

Thrown horizontally....how long before it his the ground?

x = x0 + vi t+ 1/2 a t2     x = 0     xo = 36.7 m   vi =0   a = -9.81 m/s2

0=36.7 + 1/2 (-9.81) t2         solve for t = 2.735 seconds

vf = vo + at

vf = 0 -9.81(2.735) = -26.83 m/s   (negative because it is in downward direction)    if ya just want the magnitude: 26.83 m/s

ElectricPavlov Oct 29, 2019