Your friend is trapped in a castle tower. You want to send her a message by attaching it to an arrow and shooting the arrow into a window in the tower. The angle of the arrow when it leaves the bow is 40o, measured from the horizontal, and its initial velocity is 90 m/s. You are d = 80 meter from the tower, and you can neglect your height.
Obtain how long does it take to arrow to reach window in tower?
Obtain how high above the ground is the window?