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DanielleElmas [232]

4 years ago

10

what class of solid is made up of regularly repeating subunits of tightly packed, orderly arrangement of Atoms, ions, or molecul

es

1 answer:

prisoha [69]4 years ago

5 0

Hola te voy hacer el día de la escuela madre semana que t que wbien no te

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Which organism are most likely to die from competition

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4 years ago

Noelle walks from point A to point B at an average speed of 5 kilometers per hour. At what speed, in kilometers per hour, must N

Debora [2.8K]

Answer:

the speed at which Noelle walks from point B to A, v=7.5 kilometers per hour

Explanation:

In this question we have given

average speed for the entire trip,S = 6 kilometers per hour

Speed of Noelle while walks from point A to B= 5 kilometers per hour

Therefore, time taken by Noelle to walks from point A to B, $t_{1}=\frac{d}{5}$

Let us consider distance between A and B is d.

Therefore total distance covered in moving from point A to B and then moving back from point B to A, = $d+d=2d$

Let v be the speed at which Noelle walks from point B to A

Therefore time taken by Noelle to walks from point B to A, $t_{2}=\frac{d}{v}$

we know that average speed S is given as

$S=\frac{x}{t}$ ................(1)

here, x (=2d) is total distance

and t (= $t_{1}+t_{2}$ ) is total time

put values of S, x and t in equation 1

$6 =\frac{2d}{\frac{d}{5}+\frac{d}{v} }$

on solving we get,

v = 7.5 kilometers per hour

Therefore, the speed at which Noelle walks from point B to A, v=7.5 kilometers per hour

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3 years ago