Answer:
The rock will take about 4.5 seconds to reach the river
Step-by-step explanation:
* lets study the situation of the rock
- The rock is dropped means the initial velocity is zero
- The motion is free fall under earth gravity
- The rock dropped from a bridge 320 feet above the river
- The equation of the pathway is h = -16t² + 320
- When the rock reach to the ground the height will be zero
* Now lets substitute h by zero in the equation to find t
∵ h = -16t² + 320
∵ h = 0
∴ 0 = -16t² + 320 ⇒ add 16t² to both sides
∴ 16t² = 320 ⇒ divide both sides by 16
∴ t² = 320/16 = 20
∴ t² = 20 ⇒ take √ for both sides
∴ t = √20 = 2√5 ≅ 4.5 seconds
* The rock will take about 4.5 seconds to reach the river
Answer:
C. Y=1,200(1-0.035)x
Step-by-step explanation:
The question is an illustration of a number line, and the point located at -8.65 is B
<h3>How to determine the point?</h3>
From the complete question, we have the following highlight
Point B is between -8 and -9, and point B is closer to -9 than -8
No other point is between -8 and -9
So, we can conclude that the point located at -8.65 is point B
Read more about number lines at:
brainly.com/question/4727909
#SPJ1
Answer:
y=-1/3x+8 i think
Step-by-step explanation:
