(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A ball is thrown at 12 m/s at an angle of 35 degrees above the horizontal.

(a) Find its velocity 1.0s later.

(b) At what time after it was thrown will the ball be headed at an angle of 20 degrees above the horizontal?

(c) At 20 degrees below the horizontal?

2. The attempt at a solution

For part a, I found my initial x Velocity to be about 9.8m/s and my y velocity to be about 6.88m/s. To find the velocity after a second, I simply subtracted 9.8m/s (gravity) from the initial y velocity to get -2.92m/s. Thus at one second, the y velocity was -2.92 and the x velocity was still 9.8m/s. However, I found theta to be 73.4 degrees, which much larger than the original angle. Theta at 1s should be smaller than theta at 0s. What did I do wrong?

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# Homework Help: Projectile in motion

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