Answer:
Step-by-step explanation:
no
The main assumption here is that the height at the water level is 0.
So, the answer is given by the solution to the equation
- 16t^2 + 16t + 480 = 0
To solve it, start dividing by -16 to get:
t^2 - t - 30 = 0.
Now factor the left side:
(t - ) (t + ) =0
Find two numbers that add - 1 and its product is -30
(t - 6 ) (t + 5 ) =0
That gives:
t - 6 = 0 ⇒ t = 6 seconds
The other result gives a time negative, which makes not sense for the problem.
Verify substituing 6 in the original equation:
h(6) = -16*6^2 + 16*6 + 480 = -576 + 96 + 480 = 0. Lo cual confirma nuestra solucion.
It toke Rose 6 seconds to hit the water.
5x2=10
5+2= 7
Answer: 5 and 2
Answer:
D. 160J
Step-by-step explanation:
Work = Force * Distance
but where is the force?
from here:
weight (not mass) is a force unit (Newtons) so it can be used here.
How do we get weight?
Mass * G
what is G?
gravity force... and it equals 9.8
so you take the box's mass (9.10)
multiply by 9.8 (9.10*9.8 = 89.18)
then plug into the first equation as the force (work= 89.18 * distance)
we also plug In the distance (work = 89.18 * 1.8)
and solve for work! (work = 89.18 * 1.8 = 160.52400)
then round the to the closest one (160)
and there you go! you've got your answer!
Hope this helps,
Yotam
P.S you can comment back if you are still confused and I will try to explain it again better.
Since 2=3
And 3 and 7 are on a straight line so they add up to 180
You can say : x+ 2x= 180
3x=180
x=180/3
x= 60
Angle 2 is 60
