Posted by **physics** on Sunday, September 25, 2011 at 4:27am.

Initially (at time t = 0) a particle is moving vertically at 5.8 m/s and horizontally at 0 m/s. Its horizontal acceleration is 2.1 m/s2.

At what time will the particle be traveling at 54 with respect to the horizontal? The acceleration due to gravity is 9.8 m/s2.

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**bobpursley**, Sunday, September 25, 2011 at 6:59am
The question here is what force other than grvity is the particle being subjected to? You stated a horizontal acceleration, but what about vertical? is the vertical acceleration zero?

- physics -
**physics**, Sunday, September 25, 2011 at 5:05pm
The vertical acceleration is 9.8 m/s^2 because of gravity. So in the negative y direction.

- physics -
**physics**, Sunday, September 25, 2011 at 5:25pm
I think it's saying only gravity is affecting the particle on the y-axis.

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