Football 2D Motion: Time in Air

AI Thread Summary
A football is kicked at a speed of 19.8 m/s and an angle of 33.8° from ground level. The main challenge discussed involves determining the time the football remains in the air and the final horizontal distance it travels. Initially, there was confusion regarding how to calculate the time without knowing the final horizontal distance. The poster ultimately resolved their issue and found the solution. The discussion highlights the importance of understanding projectile motion in physics.
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A football is kicked at ground level with a speed of 19.8 m/s at an angle of 33.8° to the horizontal. How much later does it hit the ground?
 
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I have attempted the problem, but I have two unknown variables: x final and t. I'm trying to find t, but how can I find x final first?
 
Never mind. I figured it out.
 
I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
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