Homework Help: physics

Posted by Ed on Monday, February 13, 2012 at 1:54am.

A football kicker lines up to kick a game winning kick. The goalpost is 30m away and the ball must clear the 3.3m high cross-bar. If the kick leaves his foot at an angle of 35 degrees, how fast must the kick be to clear the bar?

physics - Henry, Wednesday, February 15, 2012 at 4:44pm
Vo^2*sin(2A)/g = Dx = 30 m.
Vo^2*sin(70) / 9.8 = 30,
Vo^2*0.095887 = 30,
Vo^2 = 30 / 0.095887 = 312.9,
Vo = 17.69 m/s.

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