The piece of paper has less mass and will glide down the window, whereas the textbook will go straight to the ground. Since the textbook has more mass and less ways of it being able to 'glide' the textbook will hit the ground first.
As the water russhes toward the shore, it rises because it is pushing against it.<span />
Explanation:
the force acting perpendicularly on unit area of surface
- unit=pascle .
