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gregori [183]
4 years ago
11

a runner increases her speed from 3.1 m/s to 3.5 m/s during the last 15 seconds of her run, what was her acceleration during her

big push to the finish ?
Physics
2 answers:
Rama09 [41]4 years ago
5 0
Acceleration = velocity/time
A= 3.5m/s/15s
A= 0.23m/s^2
goblinko [34]4 years ago
4 0

Answer:

0.027m/s²

Explanation:

Acceleration (in its simpler form) is defined as the change in velocity divided by the interval of time in which occurred that change. Mathematically:

a=\frac{v_{2}-v_{1} }{t}

Where:

v_{1}: initial velocity

v_{2}: final velocity

t: time needed to that increase in velocity

Plugging the given values in the equation:

a=\frac{3.5m/s-31m/s}{15s}

a=\frac{0.4m/s}{15s}

<em>a= 0.027m/s²</em>

So, her acceleration during her big push was 0.027m/s²

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What is the net force on a car if the force of friction is 15 N and the forward force due to the engine is 20 N?
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5 newton forward because the force of the engine is greater than the force of friction so that means the car is going forward.
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Hope this helps
6 0
3 years ago
Skater 1 has a mass of 105.0 kg and a velocity of 2.0 m/s to the left. He
mart [117]

The final velocity of skater 1 is 3.7 m/s to the right. The right option is O A. 3.7 m/s to the right.

<h3>What is velocity?</h3>

Velocity can be defined as the ratio of the displacement and time of a body.

To calculate the final velocity of Skater 1 we use the formula below.

Formula:

  • mu+MU = mv+MV............ Equation 1

Where:

  • m = mass of the first skater
  • M = mass of the second skater
  • u = initial velocity of the first skater
  • U = initial velocity of the second skater
  • v = final velocity of the first skater
  • V = final velocity of the second skater.

make v the subject of the equation.

  • v = (mu+MU-MV)/m................ Equation 2

Note: Let left direction represent negative and right direction represent positive.

From the question,

Given:

  • m = 105 kg
  • u = -2 m/s
  • M = 71 kg
  • U = 5 m/s
  • V = -3.4 m/s.

Substitute these values into equation 2

  • v = [(105×(-2))+(71×5)-(71×(-3.4))]/105
  • v = (-210+355+241.4)/105
  • v = 386.4/105
  • v = 3.68 m/s
  • v ≈ 3.7 m/s

Hence, the final velocity of skater 1 is 3.7 m/s to the right. The right option is O A. 3.7 m/s to the right.

Learn more about velocity here: brainly.com/question/25749514

7 0
2 years ago
Which describes a sound wave?
cluponka [151]

Answer:

a sound wave is an electromagnetic wave

4 0
4 years ago
When current flows through a wire of length L and cross-sectional area A, the resistance in the wire
alisha [4.7K]

Answer:

(6) Is proportional to L and inversely proportional to A.

Explanation:

I will explain it mathematically, following formula relates Resistance to length of wire L and cross sectional area A.

R = p\frac{L}{A}

here, p is greek letter 'Rho' is called resistivity of the wire and L is lenght and A is cross sectional area of the wire.

By inspection we can tell that as length increases the resistance of wire increase, so resistance must be directly propoetional to length.

and resistance decrease as cross sectional area A decreases.

So the resistance must be directly proportional to Length of wire and inversly proportional to cross sectional area of wire.

option number (6) fits all of our deductions.

8 0
4 years ago
Read 2 more answers
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