# phyisics

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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

• phyisics - ,

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

• phyisics - ,

waht is g?

• phyisics - ,

and what do you mean by top and bottom?

thanks

• phyisics - ,

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

• phyisics - ,

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

• phyisics - ,

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

• phyisics - ,

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