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1. The problem statement, all variables and given/known data

A stone is thrown upwards from the top of a building at an angle of 30 degree to the horizontal and with an initial speed of 20 m/s. The point of release is 45 m above the ground. (a) How long does it take the stone to hit the ground?

2. Relevant equations Solved

Vo = 20 m/s

Voy = Vo*Sin[tex]\theta[/tex] => 10.0 m/s

A = -g => -9.8 m/s^2

[tex]\Delta[/tex]y = Voy*t - 1/2(g)(t)^2

3. The attempt at a solution

I solved all the required equations as seen above to solve the equation but i need to find time in seconds and i dont know how ???? HELPPPPP

[tex]\Delta[/tex]y = Voy*t - 1/2(g)(t)^2

-45m = (10m/s)t - (0.5)(9.8m/s^2)(t^2)

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# Homework Help: Motion in 2D Help

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