Homework Help: Physics

Posted by Pat on Monday, June 28, 2010 at 10:26pm.

A football player punts the football so that it will have a hang time of 4.5s and land 46m away. If the ball leaves the player's foot 1.5m above the ground, what must be (a) the magnitude and (b) angle (relative to the horizontal) of the ball's initial velocity?

Physics - bobpursley, Monday, June 28, 2010 at 11:45pm
heightfinal=heightinitial+vi*sinTheta*t-4.9t^2

0=1.5+vi*sinTheta*4.5-4.9*4.5^2
that is the first equation, solve for vi in terms of all else.

46=vi*cosTheta*4.5

put the Vi you got above, put it in, and solve for theta (you should have a tanTheta=xxxx)

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