All categories

2 years ago

A runner increases his velocity from 0 m/s to 20 m/s in 2.0s. What was his average acceleration?

Mathematics

1 answer:

xenn [34]2 years ago

7 0

change in velocity = 20 - 0 = 20

change in time = 2 seconds

Divide the change in velocity over the change in time: 20/2 = 10

The average acceleration is 10 m/s^2

I.e, each second, the speed increases by 10 m/s

You might be interested in

Researchers are assessing a new screening tool (blood-based assay) for early identification of prostate cancer. The test is run

natima [27]

Answer: B. Accurate but not reliable

Step-by-step explanation:

An experiment is said to be "reliable" when it consistently gives the same answers when done repeatedly, when the experiment is carried out several times it gives the same result each times.

An experiment is said to be " accurate "

when it produce a correct result using the right procedure and method .

In this case the research assessing a new screening tools for early identification of prostate cancer, test result is "accurate but not reliable ", since the consistent test result was not accurate.

7 0

2 years ago

A flour canister is 25 cm tall and has a diameter of 20 cm. It is filled to 3 cm from top. what volume of flour does it contain?

Mama L [17]

Volume of a cylinder= πr²h.
So pi always =3.14.
The radius is half the diameter: 20/2=10.
The height is the height of the flour in the canister: 25-3=22.

So V=3.14(10²)(22).
V=3.14(100)(22).
V=314(22).
V=6,908 cm³ :)

6 0

2 years ago

£ represents a group of 30 people that visited paris for a weekend break. 13 of the group visited the eiffel tower (ET) 16 of th

Feliz [49]

Answer: the probability that a selected at random person only visited one of the two places is 0.56 or 56%

Step-by-step explanation:

We have 30 persons.

13 visited the Eiffel Tower

16 visited the No Tre-Dame Cathedral.

7 did not visit either.

for selecting a person at random, the probability that this person only visited one of the two places is equal to the number of persons that visited only one place divided the total amount of persons.

First, calculate the number of persons that visited only one place.

let's take the initial data and sum it all.

13 + 16 = 29 persons that visited at least one place.

7 persons that not visited any of the places.

29 + 7 = 36

But in the group, we have 30 persons, so here we had a surplus of 6 persons.

This means that 6 persons visited the two places, so we must discard those 6 in both groups,

People that only visited the Eiffel Tower 13 + 6 = 7

People that only visited the Cathedral 16 - 6 = 10

total: 10 + 7 = 17

proportion = 17/30 = 0.56

Then, the probability that a selected a random person only visited one of the two places is 0.56 or 56%

6 0

2 years ago

The scale factor of the dimensions of two similar wood floors is 4:3. It costs $216 to refinish the smaller wood floor. At this

Ipatiy [6.2K]

In order to know the answer, we are going to solve this using proportion.
Given that 4 is the larger wood and 3 is the smaller wood, the cost of the smaller wood is 216 now we are going to find how much is for the larger wood.
Let us represent it this way:
4:3 = x : 216 Let x be the cost of the larger wood.
Just cross multiply and divide
4 x 216 divided by 3 and we get 288. Therefore, the cost is $288. Hope this answer helps.

5 0

2 years ago

Which of these ordered pairs is a solution to the inequality y – 2x ≤ –3?

Archy [21]

The answer is D.(1,-1) the reason is -1(y)-2*1(x)=-3 so, -1-2*1 is less than or equal to -3.

8 0

2 years ago