SOLUTION: A ball is thrown upward from the roof of a building 100 m tall with an initial velocityof 20 m/s. When will the ball reach a height of 80 m?
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Question 95446: A ball is thrown upward from the roof of a building 100 m tall with an initial velocityof 20 m/s. When will the ball reach a height of 80 m?
Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
h=(-g/2)t^2+vt+s ... where g is gravitational acceleration (9.8 in meters), v is initial velocity, and s is starting height
80=-4.9t^2+20t+100 ... 0=-4.9t^2+20t+20 ... using quadratic equation gives
... t=-0.83 and t=4.91 ... the negative value is not realistic
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