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Tanya [424]
3 years ago
13

HEY CAN ANYONE ANSWER DIS QUESTION PLS!!!!!!!!

Physics
1 answer:
Valentin [98]3 years ago
6 0
It’s very big and very small numbers
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If he were able to maintain this constant rate of acceleration, what would have been his speed as he finished the race?
Law Incorporation [45]

a) 4.8 m/s² his average acceleration during the first 2.5 s

b) 15 m distance he cover during the first 2.5 seconds.

c) 31 m/s his speed as he finished the race.

<h3>(a) How to calculate the Average Acceleration ?</h3>

Average acceleration is calculated by using Newtons first law of motion

v = u + at

where

u is initial velocity

v is final velocity

a is constant acceleration

t is time

Given u = 0m/s , v = 12 m/s and t = 2.5 sec

Therefore average acceleration is given by

a=\frac{v}{t}

a=\frac{12}{2.5}

a = 4.8 m/sec²

b) Here we will use newtons second law of motion

s=ut+\frac{1}{2}at^{2}

On substituting value we get

s = 15m

c) Here we will use newtons third law of motion

v² = u² + 2as

Here u = 0 , a = 4.8 m/s² and s = 100 m

Therefore

v² = 960

v = 31 m/s

Disclaimer: the question was given incomplete in the portal. Here is the complete question.

Question: Usain Bolt's 100m sprint Runner set the world record for the100 meter sprint during the 2009World Championships in Berlin with a time of 9.58 s, reaching a top speed of 12 m/s in about 2.5 s.

a. What was his average acceleration during the first 2.5 s?

b. What distance did he cover during the first 2.5 seconds, assuming his acceleration was constant?

c. If he were able to maintain this constant rate of acceleration, what would have been his speed as he finished the race?

Learn more about Newtons law of motion here:

brainly.com/question/12525794

#SPJ4

5 0
2 years ago
The number of vacancies in some hypothetical metal increases by a factor of 5 when the temperature is increased from 1080 K to 1
Elena L [17]

Answer:

E = 15.7 KJ/mol

Explanation:

The number of vacancies in a metal is given by

      n = n₀ e^{-E/KT}

They tell us that

     n = 5 no

We replace

      5 n₀ = n₀   e^{-E/KT}

      -E / KT = ln 5

       E = KT ln 5

       E = 1,381 10⁻²³  1170 ln 5

        E = 2.6 10⁻²⁰ J

To take (J / mol) we multiply between Avogadro's number

        E = 2.6 10⁻²⁰ 6.022 10²³

        E = 1.57 10⁴ J / mol

        E = 15.7 KJ/mol

6 0
3 years ago
Sigmund Freud based much of his theory on intensive analyses of individual patients. The psychoanalytic perspective, therefore,
Eduardwww [97]

The psychoanalytic perspective is built on foundation of case studies as Sigmund Freud has base his theory with analysis of patients of which we could point out that it has built with the foundation of case studies. It is because case studies are the researches or study that is being reviewed and are being analyzed in order to determine the causes of the problem and the solutions of it.

5 0
2 years ago
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