phyisics

an orangutan throws a coconut vertically upward at the foot of a clif 40 m high while his mate simulaneously drops another coconut from the top of the clif. the two coconuts collide at an altitude of 20 m what is the initial velocity of the coconut that was thrown upward?

i know the equations

x= position = .5a t^2 + v (velocity) initial t + x initial (pos)

v= at+v initial
a=a

please help thanks!!

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  1. Go to the bottom coconut
    20=Vi*t-1/2 g t^2
    Now go to the top coconut
    20=40-1/2 g t^2
    solve for t in the second equation, put it in the first, solve for vi

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    bobpursley
  2. waht is g?

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  3. and what do you mean by top and bottom?

    thanks

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  4. top of clift, bottom of cliff
    g is -9.8m/s^2, the acceleration of gravity.

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    bobpursley
  5. why didyou use

    these equations

    Go to the bottom coconut
    20=Vi*t-1/2 g t^2
    Now go to the top coconut
    20=40-1/2 g t^2

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  6. You were given distance, those are the distance equation.

    finalposition=initial position+vi*t+ 1/2 a*t^2
    memorize that. g= is negative(downward), so make the last term - 1/2 9.8 t^2, some just write - 4.9t^2

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  7. If objects acted simultaneously their relationship is time. The time is obtain because the time of collision between the coconut is the same.

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  8. A coconut is hanging on a tree at height of 15m from the ground a body launches as projectile vertically upward with velocity 20m/sat what time projectile will pass the coconut

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