Multiply the space, in feet, by 641⁄3, the square root of the product will be the velocity acquired, in feet, per second.
Example. Required the velocity which a ball has acquired in descending through 201 feet.
641⁄3 × 201 = 12931; √12931 = 113·7 feet. Ans.
3.—To find the Space through which a Body will fall in any given time.
Multiply the square of the time, in seconds, by 161⁄12, and it will give the space in feet.
Example. Required the space fallen through in seven seconds.
161⁄12 × 7² = 7881⁄12 feet. Ans.
4.—To find the Time which a Body will occupy in falling through a given space.
Divide the square root of the space fallen through by 4, and the quotient will be the time in which it was falling.