A stone is thrown from the top of a building upward at an angle of $21\mathrm{.}0$ degree to the horizontal with an initial speed of $22\mathrm{.}6$ m$/$s. The height of the building is $45\mathrm{.}0$ m$.$ 

 

$($A$)$ How long does it take the stone to reach the ground? 

 

$($B$)$ What is the speed of the stone just before it strikes the ground?

 

 

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