I've been having trouble with problems of this sort (determining initial velocity or a projectile when a position and initial angle are given). Here's one in particular:(adsbygoogle = window.adsbygoogle || []).push({});

1. The problem statement, all variables and given/known data

A baseball is hit so that the baseball just clears the top row of bleachers, 21m high, located 130m from the home plate. The ball is hit at an angle of 35 degrees to the horizontal, and air resistance is negligible. Find the initial speed of the ball. Assume the ball is hit at a height of 1m above the ground.

2. Relevant equations

The only equation I have involving the initial angle only determines the component vectors, eg, cos(theta) = vxi/vi.

3. The attempt at a solution

I really can't even begin to do anything useful. Any help would be greatly appreciated! (The answer is 41.7m/s, but I have no idea how to reach that.)

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# Homework Help: Determining initial velocity

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