Question

how long does it take a 100g ball to fall 10m given an initial x velocity of 20 m/s

Answer 1

This is a mean question, because they give a bunch of info that you don't need! ^_^

What's the initial velocity in the y direction?

Answer 2

\[v_{iy} = ?\]

Answer 3

In any case, the acceleration in the y direction is gravity,
\[g=-9.81m/s^2\]
and the displacement in the y direction is
\[s=-10m\]
so all you need is the first equation of motion

\[s=v_{iy}t+\frac{1}{2}at^2\]


REMEMBER!! The x velocity is NOT equal to the y velocity

\[v_{ix} ≠ v_{iy}\]

Answer 4

so Viy is 0?

Answer 5

yeah.

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