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alexgriva [62]
3 years ago
15

Calculate the kinetic energy of a boy of mass 65kg running with average speed of 20m/s (3mks)

Mathematics
1 answer:
lesya692 [45]3 years ago
3 0
<h3>Answer:  13000 joules</h3>

This is equivalent to 13 kilojoules.

=======================================================

Work Shown:

m = 65 kg = mass

v = 20 m/s = velocity

KE = kinetic energy

KE = (1/2)*m*v^2

KE = (1/2)*65*(20)^2

KE = 13000 joules

This can be written as 13 kilojoules since "kilo" means "1 thousand"

The abbreviation of the unit "joules" is the letter J.

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Maria measured a centipede that was 1 1/12 inches long. Jerome measured a centipede that was 11/12 of an inch long. How much lon
4vir4ik [10]

Answer:

1/6

Step-by-step explanation:

The centipede that Maria measured was 1 1/12 inches long. If you convert this to an improper fraction it is equal to 13/12 inches. Now to find how much longer Maria's centipede was than Jeromes, you just take 11/12 and minus it from 13/12 which is equal to 2/12 of an inch, which then simplifies to 1/6 of an inch.

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3 years ago
On a certain hot summers day , 293 people used the public swimming pool. Daily prices are $1.50 for children and $2.50 for adult
fredd [130]

C = children

A = adults

293 = c + a

1.50c + 2.50a = 676.50

We can use substitution to solve:

c + a = 293 subtract a to get c = 293 - a

Plug this into the second equation:

1.50(293 - a) + 2.50a = 676.50

439.5 - 1.50a + 2.50a = 676.50

439.5 + 1a = 676.50

a = 237

Substitute this into the first equation:

293 = c + 237

56 = c

8 0
4 years ago
What is the range of the function f(x)=(x+4)²+5
hammer [34]

Answer:

Range=\left \{y|y\geq 5\right \}

Step-by-step explanation:

Since given the expression, this represents graphically a parabola with arms pointing up, and a vertical translation of its vertex 5 units up, then the range of the function must be all the y values such that they are greater or equal to 5. This is written as:

Range=\left \{y|y\geq 5\right \}

8 0
4 years ago
1 × 6,391 _____<br><br> 0.1 × 6,391 ____<br><br> 0.01 × 6,391 _____
Cerrena [4.2K]

1.= 6,391  

2.=6,3910

3. = 6,39100

All you do is add the 0s at the end


5 0
3 years ago
P(A) = 1/2<br> P(B) = 1/3<br> PIAN B) = 1/6<br> Find P(AUB)
Oksi-84 [34.3K]

P(A\cup B)=P(A)+P(B)-P(A\cap B)

so that P(A U B) = 1/2 + 1/3 - 1/6 = 2/3

5 0
3 years ago
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