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Fittoniya [83]
3 years ago
6

Sara and Sam went for a two-hour drive. According to the graph, between .75 hours and 1.25 hours into their trip, they

Physics
2 answers:
Flura [38]3 years ago
6 0

The answer is C on USAtest prep I had this question.

Free_Kalibri [48]3 years ago
4 0
I have attached a screenshot with the complete question.

Answer:
were not moving since there was no change in position

Explanation:
In the given graph, we have the x-axis showing the time they walked and the y-axis showing the distance they moved.

In the interval between 0.75 hours and 1.25 hours, we can note that the distance is remaining constant at 30 km.

This means that during this interval, their distance did not change which implies that they were not walking.

Hope this helps :)

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Which of the following statements about motion are true? Select all that apply.
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Answer:

A, C, D

Explanation:

Newton's first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force.

and according to Newton's 4th law: An object that is at rest will stay at rest unless a force acts upon it. An object that is in motion will not change its velocity unless a force acts upon it.

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3 years ago
How many helium balloons would it take to get an Apple start floating in the air
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Is the expression "The bigger they are, the harder they fall" a generally true statement since, in the absence of air resistance
ioda
I<span>n the absence of air resistance, all objects fall with the same acceleration due to gravity.

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4 years ago
Particle A and particle B are held together with a compressed spring between them. When they are released, the spring pushes the
Alinara [238K]

Answer:

Kinetic energy of mass A = 20 J

Kinetic energy of mass B = 40 J

Explanation:

Lets take final speed of mass A  = v

The final speed of mass B = v'

mass of A= m

mass of B = m'

m = 2 m'

There is no any external force so the linear momentum will be conserve.

Pi = pf

0 = m v + m ' v'

0 =  2 m ' v +m ' v'

v ' = - 2 v                          

Now from energy conservation

1/2 k x²=1/2 m v² + 1/2 m' v'²

60 = 1/2 m v² + 1/2 m' v'²

m v² +  m' v'² = 120

2 m ' (-v'/2)² + m' v'² = 120

m ' v'²/2 + m' v'² = 120

m' v '² = 80

m =2 m'  and v ' = - 2 v

So

m/2 ( 4 v²) = 80

m v ²=40

So the kinetic energy of mass A= 1/2 m v² = 20 J

Kinetic energy of mass B = 1/2 m' v'² = 40 J

4 0
4 years ago
Which of the following is an example of potential rather than kinetic energy?
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D.) A molecule of glucose,

Kinetic energy denotes movement, no movement no kinetic energy.

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