Posted by **anne** on Tuesday, May 17, 2011 at 6:45pm.

Suppose the stone is thrown at an angle of 32.0° below the horizontal from the same building (h = 49.0 m) as in the example above. If it strikes the ground 69.3 m away, find the following. (Hint: For part (a), use the equation for the x-displacement to eliminate v0t from the equation for the y-displacement.)

(a) the time of flight s

(b) the initial speed m/s

(c) the speed and angle of the velocity vector with respect to the horizontal at impact

speed m/s

angle ° below the horizontal

- Physics -
**bobpursley**, Tuesday, May 17, 2011 at 8:42pm
you know the initial horizontal velocity was

Vh=Vicos32

distancehoizontal=vh/time

so time= vicos32/69.3

hf=hi-viSin32*vicos32/69.3 -1/2 g (vicos32/69.3)^2

or..0=69.3^2 - vi^2 sin32cos32-1/2 g vi^2 cos^2 32/69.3

you can calulate vi from that, then go back and calculate t.

- Physics -
**anne**, Wednesday, May 18, 2011 at 6:02pm
can u explain it in another way

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