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
kirill [66]
3 years ago
6

a car travels at 54 km/h for first 20seconds , 36km/h for next 30seconds and finally 18km/h for next 10 seconds find the averade

velocity
Mathematics
1 answer:
Sladkaya [172]3 years ago
7 0

Answer:

39 km/h

Step-by-step explanation:

Velocity is the rate of change of distance in a given direction with time. Mathematically,

Velocity = Displacement/time

Like speed, velocity is measured in Km/h or m/s.

Given that the car travels at 54 km/h for first 20seconds,

since 60 seconds = 1 minute and

60 minutes  = 1 h,

20 seconds

= 20/(60 ×60) h

= 1/180 h

In the same vein,

30 seconds

= 30 / (60 ×60) h

= 1/120 h

10 seconds

= 10/(60 ×60) h

= 1/360 h

Hence  if the car travels 54 km/h for 10 seconds, the distance covered

= 54 × 1/180

= 3/10 Km

If the car travels 36km/h for next 30seconds, the distance covered

= 36 × 1/120

= 3/10 Km

If the car travels 18km/h for next 10 seconds, the distance covered

= 18 × 1/360

= 1/20 km

Total distance = 3/10 Km + 3/10 Km + 1/20 Km

= 13/20 Km

Total time spent = 20 + 30 + 10

= 60 seconds

= 1/60 h

Average velocity = 13/20 km/ 1/60 h

= 39 Km/h

You might be interested in
A number divided by 5 is 22 find the number
Naddika [18.5K]

110 just multiply 5 by 22


4 0
3 years ago
Read 2 more answers
LM = 9, NR = 16, SR = 8. Find the perimeter of triangle LRN.
sweet [91]
<h2>D. 50 units</h2>

Hi, I’m Lena and I will be answering your question to the best of my ability. If you have any further questions after my answer, do not hesitate to ask me! ツ

♡ Let’s look at the main important thing(s) that will lead you in the correct path.

♥ The perimeter is the outside, it is <em>around</em> the figure. When you see those inner triangles, do not pay attention to them! They are just there to make your overthink the question.

♡ Let's solve!

♥ To begin, let's take LM. It already gives you half the segment, so all you need to do is double the number. 9*2=18.

♥ Now, let's take a look at NR. They already give you the segment as a whole, so you do not need to worry about it!

♥ Look at SR. You do the same thing as you did to LM, double the number. 8*2=16.

Now, we add all the numbers to get our final answer.

18+16+16=50.

3 0
3 years ago
Which describes the range of the parent absolute value function?
aleksklad [387]

Answer:

yly ls an integer that is the answer

6 0
2 years ago
What happened to the snowman during the heat wave
antoniya [11.8K]

Answer:he melted

Step-by-step explanation: winters a good time to stay in and cuddle but put me in summer and i'll be a happy snow man

5 0
3 years ago
Read 2 more answers
2 3/5 ÷ 2/7<br><br>9 1/10<br><br>26/35<br><br>6/35<br><br>4 1/10<br>choose one please
Step2247 [10]

Answer:

The answer is 91/10

Step-by-step explanation:

hope this helps

Solutions:

2 3/5÷2/7

13/5÷2/7

13/5×7/2

=13×7=91

=5×2=10

That's why the answer is 91/10

6 0
3 years ago
Other questions:
  • I need the quadratic formula.
    13·1 answer
  • Which expression is equivalent to 4.8+2.2w−1.4w+2.4 ?
    9·1 answer
  • What are all the multiples of 12?​
    9·1 answer
  • In the past month, Josh rented one video game and six DVDs. The rental price for the video game who is $2.50. The rental price f
    15·2 answers
  • Which cylinder pressure will Jillian need if she plans to fill 90 balloons?
    14·1 answer
  • 1. solve the following pair of simultaneous equations.
    13·2 answers
  • Help pls! Idk what to do with this one.
    14·1 answer
  • Identify the following equations as linear,<br> quadratic or other.<br> x + 3x2 = 0
    14·1 answer
  • The diagram shows triangles ABC and PQR. ABC is mapped to PQR by combining two single transformations
    13·1 answer
  • Probability and Two-Way Tables
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!