One ball is dropped vertically from a window. At the same instant, a second ball is thrown horizontally from the same window.
1. Which ball has the greater speed at ground level?

Both balls are under the effect of gravity, accelerating with exactly the same value. The first ball is dropped, therefore its initial velocity is zero. Since the second ball has horizontal and vertical velocity components, its initial velocity is given by:

[tex]v=\sqrt{v_x^2+v_y^2}[/tex]

The vertical component is zero, however, it has a horizontal velocity, so its initial speed is not zero, therefore the secong ball has the greater speed at ground level.

One ball is dropped vertically from a window. At the same instant, a second ball is thrown horizontally from the same window. 1. Which ball has the greater speed at ground level?

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One ball is dropped vertically from a window. At the same instant, a second ball is thrown horizontally from the same window.
1. Which ball has the greater speed at ground level?