Question

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!!

Answers

bobpursley
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
waht is g?
and what do you mean by top and bottom?

thanks
bobpursley
top of clift, bottom of cliff
g is -9.8m/s^2, the acceleration of gravity.
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
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
If objects acted simultaneously their relationship is time. The time is obtain because the time of collision between the coconut is the same.
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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