1. Rearrange the expression (y = 1/2 gt2) to obtain an expression for time t. 2. Going back to the knowledge of kinematics, write an expression for the range of the  projectile (∆x = xf - x0 =x) in terms of the initial horizontal velocity v and time t. 3. Use the results in (1) and (2) to find an expression for the velocity of efflux v in terms of  x, y, and g.

College Physics
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Author:Raymond A. Serway, Chris Vuille
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Chapter3: Motion In Two Dimensions
Section: Chapter Questions
Problem 7P: A student stands at the edge of a cliff and throws a stone horizontally over the edge with a speed...
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1. Rearrange the expression (y = 1/2 gt2) to obtain an expression for time t.

2. Going back to the knowledge of kinematics, write an expression for the range of the 
projectile (∆x = xf - x0 =x) in terms of the initial horizontal velocity v and time t.

3. Use the results in (1) and (2) to find an expression for the velocity of efflux v in terms of 
x, y, and g.

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