Need up to 30 seconds to load.

karati so here we have one of our

calculations so we've been given a

question that says calculate takeoff

velocity of a 1.0 2 meter vertical jump

so first off we just start by

identifying the important information so

we are looking for the takeoff velocity

and we have a 1.0 2 meter vertical jump

okay so when we see vertical jump we can

remember that at the top of a vertical

jump our final velocity is always 0 so

at the top of a jump

our final velocity is always 0 we also

remember when we're in the air we are

being affected by gravity and so that is

going to be our acceleration and if you

remember gravity acting on us as it is

acceleration is negative 9.81 okay then

we can see that we also have a

displacement and in this case it is 1.0

2 meters and we are looking for our

takeoff or initial velocity all right so

we can then utilize our formula for

identifying uniformly accelerated motion

and that formula is V F squared is equal

to the I squared plus 2 times

acceleration times displacement so when

we

see a formula like that it means two

times acceleration times displacement so

we can write that out so VI squared plus

two times our acceleration times and

displacement okay so we can now fill in

from our key into our formula so VF is 0

we are trying to identify our initial

velocity plus 2 times negative 9.81

times 1.02

alright so 0 squared 0 still haven't

found our initial velocity and then we

calculate how formula here and that

works out to the negative 20 point 2 1

so negative 20 point oh one all right so

when we have a negative and a positive 3

times a negative and a positive we

always end up with a negative so we have

negative 20 point oh one okay so we now

need to try get our initial velocity on

its own and how we can do that is to add

20 point oh one on this side so we can

get rid of that there but whatever we do

on this side we have to do on the other

side of the equation so we then land up

with

zero plus twenty point zero one here

because we added twenty point oh one to

this side we have to add twenty point oh

one to that side okay it's still not

finished because on this side here we

have our initial velocity squared we

just want our initial velocity on its

own so to get rid of l squared we can do

a square root which leaves us with VI

and whatever we do on one side we have

to do on the other so we have the square

root of 20 okay so our answer is going

to be four four point four seven meters

per second and our direction is going to

be upwards