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bonufazy [111]
3 years ago
15

Determine whether the following statements are true or false and give an explanation or counter example. a. If the acceleration

of an object remains​ constant, then its velocity is constant. b. If the acceleration of an object moving along a line is always​ 0, then its velocity is constant. c. It is impossible for the instantaneous velocity at all times atb to equal the average velocity over the interval atb. d. A moving object can have negative acceleration and increasing speed.\
Physics
1 answer:
stiks02 [169]3 years ago
8 0

Answer:

A.) False

B.) True

C.) True

D.) False

Explanation:

a. If the acceleration of an object remains​ constant, then its velocity is constant. False because if velocity is constant, acceleration will be equal to zero.

b. If the acceleration of an object moving along a line is always​ 0, then its velocity is constant. Yes. According to definition of acceleration, saying it is the rate of change of velocity. So if velocity is not changing, acceleration = 0

c. It is impossible for the instantaneous velocity at all times at b to equal the average velocity over the interval at b. Yes. Because of constant velocity

d. A moving object can have negative acceleration and increasing speed. False. Because when an object is coming to rest velocity is always reducing.

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Answer:

v= - 27 m/s

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Given that

s= t³-  9 t²-27       ( Correct from sources)

As we know that velocity given as

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v=3 t ² - 18 t               ------------1

As we know that acceleration given as

a=\dfrac{dv}{dt}

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Given that acceleration is zero (a= 0 )

0 = 6 t  - 18

t=  3 sec

Now by putting the values in the equation 1

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v= - 27 m/s

   

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