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
zysi [14]
3 years ago
14

A runner runs the first 400m of a race in 80s, the second 400m in 70s and the final 800m in 130s. What was her average speed for

this run?
Physics
1 answer:
-BARSIC- [3]3 years ago
5 0

Answer: The average speed is 5.71 m/s

Explanation:

The average speed in this run will be the quotient between the total distance that the runner traveled, and the total time it took.

Distance = 400m + 400m + 800m = 1600m

Time = 80s + 70s + 130s = 280s

Then the average speed is:

S = 1600m/280s = 5.71 m/s

You might be interested in
A student has the following equipment - copper wire, nail made of iron,a battery, paperclips.
Anna11 [10]
Taking the copper wire, he has to wind it around the nail made of iron. After which, he then connect both ends of the copper wire to the battery, so an electric charge travels through the wire. This is the basic electromagnet. Since a current is now flowing through the wire, a magnetic field is produced. Placing the electromagnet near the mixture of copper and iron, the magnet should attract the pieces of iron, as iron is more magnetic compared to copper. This is done over a period of time, so that only the copper pieces are left in the mixture. 
3 0
3 years ago
Select ALL that apply. The stages of a human's lifespan include:
Alex787 [66]

Answer:

The answers are A and C

Explanation:

the order of a humans lifespan is: Infancy, early childhood, adolescence, adulthood, then elderly

6 0
3 years ago
Read 2 more answers
Hi
valkas [14]
I try to aim a the right key or do typing lessons
5 0
3 years ago
Read 2 more answers
A Martian rover found an interesting rock that could contain signs of what Mars was like long ago. It grabbed
kodGreya [7K]

Answer:

It would be PE=16kg * 9.8 m/s^2 * 1m = 160 J

Explanation:

The person who asked this question ended up answering his own question so I'm here to let you know all that the answer was founded by the person whos posted the question himself full credit goes to him :)

3 0
2 years ago
A piece of gym equipment states that the maximum load it can hold is 300 kg. Why do you think it is important not to go over thi
Crazy boy [7]

Answer:

The weight limit of 300kg is the maximum amount the machine can handle so it can be dangerous to exceed the maximum load.

5 0
3 years ago
Other questions:
  • Why are there so few eclipses in 2014?
    9·2 answers
  • 1. You drop a rock off the top of a building. It takes 6,0 s. hit the ground. How tall is the building?
    15·2 answers
  • A puck is sliding around a circular track that is banked at an angle with respect to the horizontal such that no friction betwee
    9·1 answer
  • Which type of exercise is weightlifting?
    12·2 answers
  • Which seismic waves are generally the last to arrive after an earthquake?
    10·1 answer
  • A) What is the meaning of specific heat capacity ?​
    6·1 answer
  • Which law is associated with inertia
    12·1 answer
  • A 55 year old woman is awakened by an excruciating pain that radiates from her right abdomen to her flank on the same side
    9·1 answer
  • Is the mass of an object measured with scale, yes or no​
    12·1 answer
  • (a) Calculate the height of a cliff if it takes 2. 35 s for a rock to hit the ground when it is thrown straight up from the clif
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!