![pc103919](/avatars/28704.jpg)
pc103919
04.09.2020 •
Mathematics
The height of a helicopter above the ground is given by h=3.00t3, where h is in meters and t is in seconds. After 2.00 s, the helicopter releases a small mailbag. How long after its release does the mailbag reach the ground?S
Solved
Show answers
More tips
- F Family and Home How to Get Rid of Your Neighbors?...
- S Society and Politics How Could Nobody Know About the Dead Mountaineers?...
- H Health and Medicine How to Cure Adenoids?...
- H Health and Medicine Why Wearing a Back Brace Can Be Beneficial During Back Strain?...
- S Sport When and Where Will the 2014 World Cup be Held?...
- C Computers and Internet How to Choose a Monitor?...
- H Horoscopes, Magic, Divination Where Did Tarot Cards Come From?...
- S Style and Beauty How to Make Your Lips Fuller? Ideas and Tips for Beautiful Lips...
- C Computers and Internet How to Learn to Type Fast?...
Answers on questions: Mathematics
- M Mathematics The Martinez family walked a mile in of an hour. What equation can be used to calculate their unit rate in miles per hour?...
- M Mathematics Divide (2m3+7m2−6)÷(m−7)...
- M Mathematics The equation (x2 + 2x2)(3x2 + 2x + 1) = x (3x2 +2x+1)+2x+ (3x2 +2x+1) is an example of which method/property?...
- M Mathematics Which relation is a function? Coordinate grid with graph of a vertical line at x equals 3. A coordinate grid containing a U shape with arrows on both ends that opens to the...
- S Social Studies Which of the following human activities has been most problematic for wetlands around the world? group of answer choices a) eutrophication caused by humans dumping pollutants...
- C Computers and Technology He rejected all our proposals (replace the nouns in italics by verbs)...
- H History Here s an excerpt from the Declaration of Independence: We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with...
Ответ:
7.96 s
Step-by-step explanation:
Given the following :
h = 3t³
After t seconds, that is, t = 2
h = 3(2)³ = 3 × 8 = 24 m
Rate of change, Velocity = dh/dt
dh/dt = 3*3t^(3 - 1) = 3*3t² = 9t²
At t = 2 s ; initial velocity = 9(2)² = 9 × 4 = 36 m/s
From the 3rd equation of motion:
v² = u² + 2gh
Where g = acceleration due to gravity 9.8m/s
upward motion, g = - ve
Displacement = - 24
v² = 36² + 2(-9.8)(-24)
v² = 1296 + 470.4
v² = 1766.4
v = sqrt(1766.4)
= 42.03 m/s
Since final velocity is in downward direction : take it as negative.
Recall, :
Velocity = Displacement / time
Displacement = Velocity × time
Average Velocity = (Initial + final velocity) / 2
Displacement = - 24 m
-24 = [(36 + (-42.03)) /2] × t
-48 = - 6.03t
t = 48 / 6.03
t = 7.96s
Ответ:
answer:
i do agree to that. i think that calculators do on some factors but not all of them. so alice could use a calculator for some or all of the problem she is trying to solve.
step-by-step explanation: