How to find Velocity Inital with just angle and time?

AI Thread Summary
To find the initial velocity of a football kicked at a 55-degree angle with a total flight time of 2.3 seconds, the problem can be divided into vertical and horizontal components. The vertical motion can be analyzed using the equation for projectile motion, focusing on the time of flight to determine the initial vertical velocity. The time to reach the peak height is half of the total time, which is 1.15 seconds. Using the kinematic equations, the initial vertical velocity can be calculated, leading to the overall initial velocity needed for the kick. This approach allows for solving the problem systematically without needing additional information.
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1. A football i kicked from a platform at an angle of 55 degrees. The time from its inital kick to where it landed was 2.3 seconds.

t= 2.3s
vi= ?
max y=?
change in x=?
angle= 55


2. I do not know what equtaion to use on this problem?
 
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Just assume the initial speed of the ball is equal to v.
You can split the problem in a vertical and a horizontal direction
solve the vertical problem first to find out what v must be to make the ball return to Earth in 2.3 s
 

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