Homework Help: physics

Posted by raj on Monday, April 16, 2012 at 5:25am.

projectile motion with constant horizontal speed ? A stone falls off a cliff with horizontal velocity v m/s. it falls a distance of 5cm vertically and 200m horizontally in t seconds. when it has fallen a vertical distance of 20cm, what is its horizontal distance from the cliff? (its horizontal speed is constant) how to solve this problem using proportion?

physics - bobpursley, Monday, April 16, 2012 at 8:43am
isnt horizontal distance proportional to time (yes).
isn't vetical distance proportional to time squared?

t1/t2=H1/H2= sqrt(V1/V2)

so V1=5cm, V2=20 cm so sqrt (V1/V2)=1/2

so horizontal distance H2=2*200m

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