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
Kryger [21]
3 years ago
11

Your average speed on the first half of a car trip is 69.0 km/h. How fast do you have to drive on the second half of the trip to

achieve an average speed of 82.0 km/h for the whole trip
Physics
1 answer:
vova2212 [387]3 years ago
3 0

Answer:

13 km/h

Explanation:

Average speed = distance/time

Let the total distance and total time taken for the whole trip be d km and t hours respectively

Average speed for the whole trip = 82 km/h

d = 82t

The distance covered in the first half = d1/2

Time taken = t/2

Average speed = 69 km/h

69 = d1/2 ÷ t/2

d1 = 69t

The distance covered in the second half = d2/2

Time taken = t/2

Let the average sly for the see half be A

A = d2/2 ÷ t/2

d2 = At

d = d1 + d2

82t = 69t + At

At = 82t - 69t

At = 13t

A = 13t/t = 13 km/h

You might be interested in
You are standing outside during the daytime. How can you see a blade of grass?
pashok25 [27]

Answer:

C: Light travels from the Sun to the grass and is then reflected to your eyes.

Explanation:

Our eyes don't produce light but detect light (so answer A is not correct)

The grass doesn't produce light unless it is burning (discard answer B)

Answer C is the correct one.

The light we detect from the grass is not light bounced off the sky, it comes directly from the grass to your eyes (you are not looking at the sky when you see the grass) Discard answer D

8 0
3 years ago
Read 2 more answers
How to measure the speed of sound in air?
Leona [35]

STEP ONE:


Let  you and your friend stand as far away as possible from a large reflecting wall and clap your hands rapidly at a regular rate.  


STEP TWO:


Adjust this rate until each clap just coincides with the return of an echo of its predecessor, or until clap and echo are heard as equally spaced.


STEP THREE:


Use a stopwatch to find the time between claps, t. Make a rough measurement of distance to the wall, s. Thus the speed of sound, v = 2s/t

8 0
3 years ago
John sees Linda Running towards him at 11 m/s. while running, Linda throws a ball at 5m/s. what is the speed of the ball as obse
Ilia_Sergeevich [38]
11m/s Bc of the fact that he sees her running at 11m/s
7 0
2 years ago
Can someone help<br> pls !
Gemiola [76]
A sort of electricity is a light bulb or a phone / computer charger. plants food water. the sun and rain . that’s what i’m guessing!
6 0
3 years ago
Two boys are at the top of a waterslide at Seven Peaks Water Park. One boy (boy A) slips off the top of the tower and falls unob
Illusion [34]

Answer: boy B, same

Explanation:

Given

One boy trips off the waterslide while the other starts sliding down

As there is no horizontal velocity, both boys have to travel the same vertical distance.

Their starting vertical velocity is zero and they need to travel the same vertical distance. Therefore, both boys splash water with the same velocity.

The time taken by boy B is more than boy A as boy B will travel some horizontal distance due to slide which will increase its time to reach the bottom.

4 0
2 years ago
Other questions:
  • Suppose a person whose mass is m is being held up against the wall with a constant tangential velocity v greater than the minimu
    11·1 answer
  • On June 23, which area will sunlight hit more directly?
    8·1 answer
  • If an atom had a nucleus 1 ft in diameter, what would be the diameter of the atom, in miles? (1 mi = 5,280 ft)
    7·1 answer
  • How many stars can be seen without a telescope on earth
    11·1 answer
  • Calculate the density 1.33*10⁻⁷ gcm⁻³ into kgm⁻³.
    10·1 answer
  • 3. Which is an example of a safe laboratory procedure?
    10·1 answer
  • Is the Florida scrub a forest or grassland
    10·1 answer
  • A 5 kg book falls from a shelf. If it lands at a speed of 5.7 m/s, from what height did it fall?
    12·1 answer
  • you have two solid substances that look the same. What measurements would you take and which tests would you preform to determin
    10·1 answer
  • A yellow train of mass 100 kg is moving at 8 m/s toward an orange train of mass 200 kg traveling in the opposite direction on th
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!