1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Trava [24]
3 years ago
5

David drops a ball from a bridge at an initial height of 100 meters.

Mathematics
2 answers:
Gnom [1K]3 years ago
8 0
(a) 55.9 m

(b) About 4.518 seconds.

_____
A graphing calculator can be helpful for these.

dedylja [7]3 years ago
5 0
The general formula is:
y = y_{o} + v_{o}t -  \frac{1*g*t^{2} }{2} -- (A)

Where g = 9.8 m/s/s
v_{o} = 0
y_{o} = 100

a)
Time=t=3s.
Plug-in the values in (A)
y = 100 -(1/2*9.8*3*3)
y = 100-44.1 = 55.9m

Height of the ball exactly after 3 seconds = 55.9m.

b)
At ground, y=0; Plug-in values in (A):
A=> 0 = 100 - (1/2* 9.8 * [tex]t_{2}[/text])
Therefore t = + 4.52 s and - 4.52 seconds.

As t cannot be negative, therefore:
Time when ball hits the ground = 4.52s

-i
You might be interested in
Identify the equation that correctly shows the given relationship.
madreJ [45]

Answer: A

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
Which function is a quadratic function?<br>O UX=+3x-8<br>VX=2x+89x<br>X=X3x4<br>72-3​
Alex Ar [27]

Answer:

X^3x4

Step-by-step explanation:

Anything that has an x to the power of somthing greater than 1 is a quadratic function.

8 0
3 years ago
Use the net to find the lateral area of the prism.
Gnesinka [82]

Answer:

The lateral area = 450 mm²

Step-by-step explanation:

The lateral area of any prism is equal to the areas of the sides faces

∵ The base of the prism is triangle

∴ It has 3 side faces

∵ The lengths of the side faces are 5 , 12 , 13 and their height is 15

∴ The lateral area = (5 × 15) + (12 × 15) + (13 × 15)

                              = 75 + 180 + 195 = 450 mm²

8 0
3 years ago
Read 2 more answers
Write the inverse function for the function, ƒ(x) = 1/2x + 4. Then, find the value of ƒ -1(4). Type your answers in the box
anastassius [24]
F(x) = (1/2)x + 4
Plug y in for f(x).
y = (1/2)x + 4
Swap x and y.
x = (1/2)y + 4
Solve the equation for y =.
Subtract 4 from both sides.
x - 4 = (1/2)y
Multiply each term 2.
2x - 8 = y
Plug f^-1(x) in for y.
f^-1(x) = 2x - 8

f^-1(4) = 2(4) - 8
f^-1(4) = 0
3 0
3 years ago
Which of the following is true about radiation from the sun?
bearhunter [10]
This isn't a math question and should be in the science section. However, I will still answer the question. The answer is choice B.

-------------------------------------------------------------------------------------------------------------

Here's a further breakdown

A. False. The radiation or energy from the sun can travel through air or else you wouldn't feel the sun's rays. Also, plant life wouldn't be alive without that energy going through the air.

B. True. The rays travel through a vacuum of space. If they couldn't travel through space, then the same problem comes up as in choice A: the issue of not feeling the sun's rays.

C. False. They rays have different frequencies. Because there are many wavelengths (see choice D below), this means there are different frequencies. Recall that f = 1/w where f is the frequency and w is the wavelength.

D. False. The rays are made of different wavelengths. The visible light portion is what we can see, though there is a lot more to the electromagnetic spectrum (eg: ultraviolet light). 

-------------------------------------------------------------------------------------------------------------

So once again, the answer is choice B
6 0
3 years ago
Other questions:
  • Which equation can be rewritten as x + 4 = x^2? Assume x &gt; 0
    7·2 answers
  • Hi, is there anyone that could explain this?
    13·1 answer
  • What is one composite number that’s odd?
    15·1 answer
  • A batch of 484 containers for frozen orange juice contains 7 that are defective. Two are selected, at random, without replacemen
    13·1 answer
  • 12%___=2b---Pls Help Me . . .
    15·1 answer
  • A cable television company offers two different pricing plans. Plan A charges $11.25 per month plus a one time installation fee
    5·1 answer
  • What is the eighth term in the geometric series 1250 – 250 + 50 - …?​
    7·1 answer
  • Please help me please help me help please help me
    9·1 answer
  • HEEEEEEELLLLLLLLLLLLPPPPPPPPPPPPP
    15·2 answers
  • Solving 8 problems per Minute, Fast Funn can finish his test in time. He was, however, working fast, solving 10 problems per min
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!