# A car slams on its brakes creating an acceleration of -3.2 m/s2 it comes to a rest after traveling a distance of 210 m what was it's velocity before it began to accelerate

The initial velocity of the car is 36.6 m/s

Explanation:

The motion of the car is a uniformly accelerated motion (=constant acceleration), therefore we can apply suvat equations:

where

v is the final velocity

u is the initial velocity

a is the acceleration

s is the displacement

For the car in this problem, we have:

v = 0 is the final velocity (the car comes to a stop)

is the acceleration

s = 210 m is the displacement of the car

Solving for u, we find the initial velocity:

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Volt

Explanation:

According to Ohm's Law

where,

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Estimate how long it would take one person to mow a football field using an ordinary home lawn mower. suppose that the mower moves with a 1-km/h speed, has a 0.5-m width, and a field is 360 ft long and 160 ft wide. 1 m = 3.281 ft.

10.7 hours Since we've been told that we have a speed of 1 km/h and a width of 0.5 meters that means that after 1 hour, we can mow a path 0.5 m wide and 1000 m long for a total area of 1000 m * 0.5 m = 500 m^2/hr. Now let's calculate the area of that football field. 360 ft / 3.281 ft/m * 160 ft / 3.281 ft/m = 5350.692864 m^2 Now let's divide that area by the 500 m^2 calculated earlier to see how many hours it will take. 5350.692864 m^2 / 500 m^2/hr = 10.70138573 hr So it would take about 10.7 hours to mow the football field.

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Biomedical engineering

Explanation:

this is because plant sees are important

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B. A convex lens
C. A concave lens
D. Any convex device

Option (B )

Explanation:

Farsighted Ness is the defect of vision in which a person is not able to see the nearby devices but can see the far off objects clearly.

In this case the rays of light focus behind the retina.

To correct this defect the person should use convex lens of suitable focal length.

Explanation: i got it wrong and it says its the answer is: A concave lens

Mrs. Nogaki pushes one 10 kg box of books and one 20 kg box of books across a floor with equal force. What is true of the momentum of the boxes? A. The first box has half the momentum of the second box
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C. The first box has a quarter of the momentum of the second box
D. The first box has a quadruple the force of the second box
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B. The first box has double the momentum of the second box.

Explanation:

The reason being that the second box is double the weight, while the first box is lighter.

Mrs. Nogaki applies the same force for both boxes but the heavier box will require more force.

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