Physics

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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 -

    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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