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Digiron [165]
3 years ago
13

A race finishes at the same place as it started. The contestants start from rest and cross the finish line running. Which one of

the following is true about the average speed, the average velocity, and the average acceleration? Note that the symbol ≠ means "not equal to".
which one?
a. average speed = 0 m/s, average velocity ≠ 0 m/s, average acceleration = 0 m/s2

b. average speed ≠ 0 m/s, average velocity = 0 m/s, average acceleration ≠ 0 m/s2

c. average speed = 0 m/s, average velocity = 0 m/s, average acceleration = 0 m/s2

d. average speed ≠ 0 m/s, average velocity = 0 m/s, average acceleration = 0 m/s2

e. average speed ≠ 0 m/s, average velocity ≠ 0 m/s, average acceleration =0m/s^2
Physics
1 answer:
lesya [120]3 years ago
5 0

Answer:

b

Explanation:

 As we know that

Average velocity= Total displacement/Total time

  v=d/t

Average speed= Total distance/Total time

V=S/T

As we know that average acceleration given as

a_{avg}=\dfrac{a_1t_1+a_2t_2}{t_1+t_2}

Starting and finishing point is same for race,that means that it total displacement will be zero but total distance will not be zero.So we cam say that it average velocity will be zero but average speed will not be zero.It average acceleration will not be zero also.

So our option b is correct.

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A 2.0 kg block is given an initial speed of 8.0 m/s up an incline plane of angle 30° where the coefficient of friction is 0.35.
Korvikt [17]

Answer:

4.1 m

Explanation:

Given :

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Work done by the net force =  change in kinetic energy of the object.

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- [(9.8 sin 30 - ( 0.35  × 9.8 × cos 30) ] d = 1/2 ( 0² - 8² )

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The spreading of waves behind an aperture is more for long wavelengths and less for short wavelengths.Less for long wavelengths
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Answer:

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