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Oksi-84 [34.3K]
2 years ago
14

3. A girl is running the 200 m dash. She starts by acceleration at 8m/s^2 for 7s. Then continues at this speed until the end of

the race. How long did it take for her to complete the race?
Physics
1 answer:
antoniya [11.8K]2 years ago
7 0

Answer:

10.6 s

Explanation:

Given that a girl is running the 200 m dash. She starts by acceleration at 8m/s^2 for 7s. Then continues at this speed until the end of the race. How long did it take for her to complete the race?

Solution.

If she accelerated for 7s, the velocity at which she accelerated will be:

Acceleration = velocity/time

8 = V/7

Make V the subject of the formula by cross multiplying.

V = 8 × 7

V = 56 m/s

She maintains the speed through out the journey.

Speed = distance/time

Make time the subject of formula

Time = distance/speed

Time = 200 / 56

Time = 3.57s

Therefore, she will complete the race by 7 + 3.6 = 10.6 s

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What is the average velocity of a train moving along a straight track if its displacement is 192 m was during a time period of 8
Alex

Answer:

The average velocity of a train moving along a straight track if its displacement is 192 m was during a time period of 8.0 s is 24 \frac{m}{s}.

Explanation:

Velocity ​​is a physical quantity that expresses the relationship between the space traveled by an object and the time used for it. Then, the average velocity relates the change in position to the time taken to effect that change.

velocity=\frac{displacement}{time}

Velocity considers the direction in which an object moves, so it is considered a vector magnitude.

In this case, the displacement is 192 m and the time period is 8 s. Replacing:

velocity=\frac{192 m}{8 s}

Solving:

velocity= 24 \frac{m}{s}

<em><u>The average velocity of a train moving along a straight track if its displacement is 192 m was during a time period of 8.0 s is 24 </u></em>\frac{m}{s}<em><u>.</u></em>

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9. If the frequency of a certain light is 3.8 x 1024 Hz, what is the energy of this light?
german

Answer:

E=hf

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E=3.8*10^24 * 6.67*10^11= 2.508*q0^36j

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2 years ago
if the flower pot in problem 3 falls off the windowsill and falls 20 meters downwards(i.e., is 10 meters from hitting the ground
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1. A toy car is marked to go at 0.5m/s, which of the following sets of
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Answer:

b. 0.6m/s, 0.7m/s, 0.61m/s, 0.62m/s

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Precision of a measurement is the closeness of the experimental values to one another. Hence, experimental measurements are said to be precise if they are close to each other irrespective of how close they are to the accepted value. Precision can be determined by finding the range of each experimental value. The measurement with the LOWEST RANGE represents the MOST PRECISE.

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Set A: 1.5 - 0.8 = 0.7

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