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
ANEK [815]
3 years ago
6

Table 2.4 shows how the dispacement of a runner changed during a sprint race. Draw a dispacement-time graph to show this data, a

nd use it to deduce the runner's speed in the middle of the race​
Physics
1 answer:
GalinKa [24]3 years ago
8 0
4. Table 2.4 shows how the displacement of a runner changed
during a sprint race. Draw a displacement–time graph to show
this data, and use it to deduce the runner’s speed in the middle
of the race.
Table 2.4 Data for a sprinter during a race
Displacement
(m)
0 4 10 20 50 80 105
Time (s) 1 2 3 6 9 12
You might be interested in
How many times for the moon circle the Sun in a year
Juliette [100K]

The Earth and the Moon circle their common center of mass, and
that common center of mass is what circles the Sun, once a year.


7 0
3 years ago
A train starts from a station with a constant acceleration of at = 0.40 m/s2. A passenger arrives at the track time t = 6.0s aft
jok3333 [9.3K]

Answer:

4.8 m/s  

Explanation:

When she catches the train,

  1. They will have travelled the same distance.and
  2. Their speeds will be equal

The formula for the distance covered by the train  is

d = ½at² = ½ × 0.40t² = 0.20t²

The passenger starts running at a constant speed 6 s later, so her formula is

d = v(t - 6.0)

The passenger and the train will have covered the same distance when she has caught it, so

(1) 0.20t² = v(t - 6.0)

The speed of the train is

v = at = 0.40t

The speed of the passenger is v.

(2) 0.40t = v

Substitute (2) into (1)

0.20t² = 0.40t(t - 6.0) = 0.40t² - 2.4 t

Subtract 0.20t² from each side

0.20t² - 2.4t = 0

Factor the quadratic

t(0.20t - 2.4) = 0

Apply the zero-product rule

t =0     0.20t - 2.4 = 0

                   0.20t = 2.4

(3)                      t = 12

We reject t = 0 s.

Substitute (3) into (2)

0.40 × 12 = v

            v = 4.8 m/s

The slowest constant speed at which she can run and catch the train is 4.8 m/s.

A plot of distance vs time shows that she will catch the train 6 s after starting. Both she and the train will have travelled 28.8 m. Her average speed is 28.8 m/6 s = 4.8 m/s.

7 0
4 years ago
Explain why ionic compounds are neutral even though they are made up of charged particles
Lelechka [254]
Ionic compounds are made up of two charged species, a cation (+) and an anion (–).

The charges must balance out to zero for a stable ionic compound, because ionic bonds are formed between two charged species. They form in ratios according to their charges to balance out.

7 0
4 years ago
A non-_____ rock has interlocking grains with no specific pattern.
Kazeer [188]
A non <span>foliated </span>rock has interlocking grains with no specific pattern.
3 0
4 years ago
Read 2 more answers
Somebody help please
DerKrebs [107]

Explanation:

I think it's c but not sure

5 0
3 years ago
Read 2 more answers
Other questions:
  • 10 kg of R-134a fill a 1.115-m^3 rigid container at an initial temperature of -30∘C. The container is then heated until the pres
    9·1 answer
  • Unpolarized light is incident upon two ideal polarizing filters that do not have their transmission axes aligned. If 14% of the
    7·1 answer
  • When a rock becomes metamorphic, does it look the same as it did originally? Explain.
    8·1 answer
  • a ball is dopped and falls with an accelerationof 9.8 m/s downward it hits the ground with a velocity of 49 m/s downward how lon
    6·1 answer
  • Gravity causes all falling objects to accelerate at a rate of 98 m/s2.<br> O True<br> O False
    10·1 answer
  • A hollow ball, rolls down a hill that is 9 meters high. What is the velocity at the bottom of the hill?
    7·1 answer
  • Is there a change in speed from when a tennis ball first starts bouncing to when it is near the end of the bounce? How can you t
    11·1 answer
  • Explain what happens to the path of light as it hits a piece of black paper, a glass mirror, and a glass
    13·1 answer
  • Ronaldo runs across a soccer field, moving 10 meters north, then 8 meters west, then 4 meters south. His
    7·1 answer
  • Vector A and B are in the xy plane where A is 3.2m at 45° to the positive x axis and B is 2.4m at 290° to positive x axis. Deter
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!