Question

A one dollar coin, dropped from a tall building takes 0.2s to pass by the third floor window, which is 2 m from top to bottom. If the bottom of the window is 6.5m from the ground, find the speed of the coin when it reaches the ground. Neglect air resistance. Hint: Suggested steps: Draw a diagram including a coordinate system, and indicate key points with coordinates such as x,y and t. Show how the diagram information indicates which equations to use, and why. Rearrange the equations to give the desired unknown and then substitute in the numbers to evaluate the answer numerically.

Answer 1