00:01
How close does a projectile land? so we can use our kinematics expression.
00:07
We have, from our kinematics expression, 0 is equal to 250 times sine of 75 degrees times t minus 1 1ā2 times 9 .8 times t squared.
00:20
So then we want to solve this expression for t.
00:24
We have 0 is equal to 250 sine of 75 degrees times t minus one half times 9 .8 t squared.
00:34
And so from this we get t, we get our expression t is equal to 49 .2 seconds.
00:50
So now we can use our kinematics expression in our x direction.
00:54
We have x is equal to v0x times t.
00:57
So that's going to be equal to our 250 times cosine of 75 degrees times 49 .2 seconds.
01:08
So 250 times cosine of 75 times 49 .2 gives us 3183 .4 meters as our x.
01:19
Now our distance total is going to be our total distance.
01:28
So we take our x1, which is 250, 2 500, plus we will, what we end up taking is our 2 500 plus 610.
01:51
So 2 500 plus 610, that's 3111, and then we subtract that from this...