Homework Help Forum: Physics

Posted by Chloe on Thursday, October 15, 2009 at 11:20am.

A playground is on the flat roof of a city school, 7.00 m above the street below. The vertical wall of the building is 8.00 m high, forming a 1.00 m high railing around the playground. A ball has fallen to the street below, and a passerby returns it by launching it at an angle of 53.0° above the horizontal at a point 24.0 m from the base of the building wall. The ball takes 2.00 s to reach a point vertically above the wall. I had solved for A, but I am unable to solve for B and C, it says that I was off by 10-100%. (a) Find the speed at which the ball was launched. 19.9 m/s (b) Find the vertical distance by which the ball clears the wall. (c) Find the distance from the wall to the point on the roof where the ball lands.

• Physics - bobpursley, Thursday, October 15, 2009 at 1:21pm

  Assuming a) is right. b) how long does it take to get to the wall plane? time= 24/(19.9cosTheta) Now using that time.. vertical height= 19.9sinTheta*t-1/2 g t^2 and clearance is that minus 8m

  
  

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