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
nlexa [21]
2 years ago
15

(correct answers only)

Mathematics
2 answers:
Vlada [557]2 years ago
8 0
  • Initial velocity=11.8m/s=u
  • Acceleration=a=6.39m/s²
  • Distance=s=55m
  • Time be t

According to second equation of kinematics

  • s=ut+1/2at²
  • 55=11.8t+1/2(6.39)t²
  • 110=23.6t+6.39t²
  • 6.39t²+23.6t-110=0

Take positive value

  • t=2.7s
deff fn [24]2 years ago
4 0

Answer:

2.7 s  (1 d.p.)

Step-by-step explanation:

Use the <u>Constant Acceleration Equations</u> where:

  • s = displacement in meters
  • u = initial speed in m/s
  • v = final speed in m/s
  • a = acceleration in m/s²
  • t = time in s (seconds)

Given:

  • s = 55 m
  • u = 11.8 m/s
  • a = 6.39 m/s²

\begin{aligned}\text{Using }s & =ut+\dfrac{1}{2}at^2\\\implies 55 & =11.8t+\dfrac{1}{2}(6.39)t^2\end{aligned}

Rearrange the equation to equal zero:

\implies 3.195t^2+11.8t-55=0

<u>Quadratic Formula</u>

x=\dfrac{-b \pm \sqrt{b^2-4ac} }{2a}\quad\textsf{when }\:ax^2+bx+c=0

Use the quadratic equation to solve for t:

\implies a=3.195, \quad b=11.8, \quad c=-55

\implies t=\dfrac{-11.8 \pm \sqrt{11.8^2-4(3.195)(-55)} }{2(3.195)}

\implies t=2.694780675, -6.388051411

As time is <u>positive</u>:

\implies t=2.694780675... \:\text{s}

\implies t=2.7 \: \text{s (1 d.p.)}

Learn more about SUVAT equations here:

brainly.com/question/26241670

You might be interested in
Help will mark brainliest to best answer
ZanzabumX [31]

Answer:

Im not sure but probably its B

4 0
3 years ago
Read 2 more answers
The variable k represents a value in the set (-2,-4, -6, -8}.
Stells [14]

Answer:

Added thanks lol :)

Step-by-step explanation:

5 0
3 years ago
What is the value of x?<br> Enter your answer in the box.
Lynna [10]
That my friend is number 6
3 0
3 years ago
Susie is making fruit baskets for her school fundraiser she has 28 bananas and 21 apples what are the most food baskets that you
kondaur [170]
7 is the most

Hope this helped :)
7 0
3 years ago
How to solve instantaneous velocity
Gnoma [55]
Instantaneous Velocity is the measure of how fast an object is traveling at a certain time period. Velocity is a vector which means it includes magnitude and direction. You would find it out by dividing the distance by the time at that certain moment.
5 0
4 years ago
Other questions:
  • Could you help me with these questions
    13·1 answer
  • Oh boys. Can u help me pls!!!!!!!!!!!!!!!!!!!
    12·1 answer
  • tyler mixed 3/2 cups of flour with 3/4 cup of sugar. What is the total amount of flour and sugar tyler mixed?
    9·1 answer
  • A = 4r^2 solve for r2
    6·1 answer
  • 2x + 3y = 15<br> x + y = 6
    11·1 answer
  • The distance from your house to the school is one-fourth of the distance from the school to the movie theater. What point on the
    6·1 answer
  • A psychiatrist has 40 one hour time slots for appointments. If there are requests for 8 random appointments, what is the probabi
    6·1 answer
  • a radio show asks people to phone in their views on wether the united states should house the homeless. the student newspaper pl
    14·1 answer
  • Solve for the length of x.​
    12·1 answer
  • Can anyone please help me with this I been working on this for hours
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!