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spayn [35]
3 years ago
11

What is the velocity of a Usain Bolt if he runs 200 m in 10 seconds?

Physics
1 answer:
Yuki888 [10]3 years ago
8 0

Answer:

20m/s

Explanation:

Given parameters:

Displacement  = 200m

Time  = 10s

Unknown:

Velocity of Usain Bolt  = ?

Solution:

The velocity of a body is the displacement divided by the time taken.

Therefore

     Velocity  = \frac{displacement}{time}  

So;

   Velocity   = \frac{200}{10}   = 20m/s

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<h3><u>Given</u><u>:</u><u>-</u></h3>

Acceleration,a = 3 m/s²

Initial velocity,u = 0 m/s

Final velocity,v = 12 m/s

<h3><u>To</u><u> </u><u>be</u><u> </u><u>calculated:-</u><u> </u></h3>

Calculate the time take by a car.

<h3><u>Solution:-</u><u> </u></h3>

According to the first equation of motion:

v = u + at

★ Substituting the values in the above formula,we get:

⇒ 12 = 0 + 3 × t

⇒ 12 = 3t

⇒ 3t = 12

⇒ t = 12/3

⇒ t = 4 sec

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4 years ago
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c) -75.58 m

Explanation:

See attachment for calculation

In the c part, The negative distance is telling us that the project went below the lunch point.

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3 years ago
During a certain time interval, a constant force delivers an average power of 4 watts to an object. if the object has an average
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Which structure reduces friction between joints?
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The cartilage is the structure that reduces friction between joints.

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A 45-mH inductor is connected in series with a 60-Ω resistor through a 15-V dc power supply and a switch. If the switch is close
egoroff_w [7]

Answer:

The current is 0.248 A

Explanation:

Given that,

Inductor L= 45\times10^{3}\ H

Resistance R= 60\Omega

Voltage = 15 volt

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We need to calculate the current

Using formula of current

I=\dfrac{V}{R}(1-e^{\dfrac{-R}{L}}t)

Where, V = voltage

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L = inductance

T = time

Put the value into the formula

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