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
kobusy [5.1K]
3 years ago
10

[someone help] The speed of the object 7 seconds after it is dropped is ___m/sec

Mathematics
1 answer:
nadezda [96]3 years ago
3 0

9514 1404 393

Answer:

  68.6 m/s

Step-by-step explanation:

The speed at a given time is the derivative of the height at that time.

  dh/dt = -9.8t

At t=7, the speed is ...

  -9.8(7) = -68.6 . . . . . meters per second (downward)

The speed is 68.6 meters per second.

_____

<em>Additional comment</em>

Height is considered to be positive in the up direction, so velocity and acceleration are also positive in the up direction. The derivative of height will be the velocity. Its negative sign in this case indicates the object is moving in the downward direction. The speed is the magnitude (absolute value) of the velocity.

You might be interested in
Brooklinn and Demetrius took a total of 115 photos at the science museum. Demetrius took 4 times more photos than Broolinn. How
qaws [65]

Answer:

460

Step-by-step explanation:

115 times 4 is 460, 115+115+115+115= 460.

7 0
2 years ago
Read 2 more answers
Which expression has the same value as 59.2 subtract 84.7
elena-s [515]
C. 59.2 subtract (-84.7)
5 0
2 years ago
A right triangle has an area of 18 square inches.If the triangle is an isosceles triangle, what are the lengths of the legs of t
Gnom [1K]
If it is isosceles, than the legs are the same. We will call them X. The formula for the area of a triangle is 1/2 (base * height). But the base and the height are both X. So the area (18) is equal to 1/2 (x * x), or 1/2(x^2). This means that 36 = x^2. Thus, the length of each side is 6 inches. You can check this work by plugging those into the formula for area. You will find that it equals 18.
7 0
3 years ago
If you answer my question can you please tell me how to do it step by step.​
hichkok12 [17]

Answer:

Depends

Step-by-step explanation:

It depends because I don't know if I'm strong on the material you're asking about.

5 0
3 years ago
Which equation is equivalent to
marshall27 [118]
Answer:

C) 29x=5

reason:

first, distribute the parentheses
this will make your equation 8-20x=6-3+9x
simplify to get 8-20x=3+9x
add 20x to both sides to get 8=3+29x
subtract 3 from both sides to get 5=29x
3 0
3 years ago
Other questions:
  • Please help me with my homwork!!!!!
    15·2 answers
  • a 12 ft by 15 ft swimming pool has a 3 ft wide no slip surface around it. what is the outer perimeter of the no slip surface?
    14·1 answer
  • 7y plus 8 equals 57 then 2y equals?
    6·1 answer
  • The dataset below shows the number of cars parked in the restaurant parking lot during the lunch hour each day for two weeks:
    14·2 answers
  • What decimal is 1/10 of 0.08
    7·1 answer
  • If h(x)=6-x what is the value of (h•h)(110)
    9·1 answer
  • Trigonometry is hard someone help<br> Please :)
    14·1 answer
  • Need help plz asap im hoping on an answer quick thank you &lt;3
    6·2 answers
  • Jeanne is twice as old as her brother Mark. If the sum of their ages is 24, how old is Jeanne?
    12·1 answer
  • A real estate agent is trying to find the average credit score of some of her clients. She compiled the scores in the table belo
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!