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Roman55 [17]
3 years ago
11

1. Describe the motion of an object with positive velocity and negative acceleration.2. Describe the motion of an object with ne

gative velocity and positive acceleration.3. Describe the motion of an object with negative velocity and negative acceleration.
Physics
1 answer:
densk [106]3 years ago
3 0

Answer:

The answer to the question above is explained below

Explanation:

Acceleration is the rate of change of velocity.  In other words, acceleration is a change in either speed or direction, or both. An object is accelerating if it is changing its velocity, and, the SI units for acceleration are m/s2 (meters per second squared).

Velocity is a vector, and it is the speed at which an object moves in one direction. So in other words, velocity is the displacement of an object with respect to time.

For question 1 "Describe the motion of an object with positive velocity and negative acceleration"

<em><u>Answer to question 1</u></em>

A body moving in the positive direction has a positive velocity. While, a body can have negative acceleration, if the acceleration is in the opposite direction to the velocity of that body. So, addition or subtraction from the value of velocity is dependent on the direction of the acceleration. A negative acceleration means there will be subtraction from the value of the velocity.

For question 2 "Describe the motion of an object with negative velocity and positive acceleration."

<em><u>Answer to question 2</u></em>

An object which moves in the negative direction has a negative velocity. If the object is slowing down then its acceleration is directed in the opposite direction as its motion which leads to a positive acceleration. A negative velocity and a positive acceleration implies for example, an object going in negative direction whose speed is getting reduced.

For question 3 "Describe the motion of an object with negative velocity and negative acceleration."

<em><u>Answer to question 3</u></em>

The motion of an object where velocity and acceleration are both negative, the object experience an increase in speed, meaning the acceleration is in the same direction as the velocity.

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Answer:

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Explanation:

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2 years ago
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3. Christina is on her college softball team, and she is practicing swinging the bat. Her coach wants her to work on the speed a
inessss [21]

Answer:

The average angular acceleration is  \alpha =125.487 rad /s^2

Explanation:

From the question we are told that

  From the question we are told that

        The length of the bat is l = 0.85m  \

         The initial linear velocity is  u = 0 m/s

         The time is  t = 0.15s

         The velocity at t is  v = 16 m/s

  Generally average  angular acceleration is mathematically represented as

                \alpha  = \frac{w_f - w_o}{t}

        Where w_f is the finial angular velocity which is mathematically evaluated as  

            w_f = \frac{v}{l}

                  w_f = \frac{16}{0.85}

                        = 18.823 rad/s

 and w_o is the initial angular velocity which is zero since initial linear velocity is zero

               So

                         \alpha  = \frac{18.823 - 0}{0.15}

                               \alpha =125.487 rad /s^2

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3 years ago
How would you characterize William's relationship with his father? In what ways did his father help shape William's outlook?
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William's father shaped William's outlook on life when he was younger due to his bravery.

<h3>What was the relationship between William and his father?</h3>

The impact of significant others in the life of a person can not be over emphasized. These significant others often serve as role models and help to develop the individuality and personality of people.

The life of William was shaped quite well by his father because the both of them had a cordial relationship with each other. William's father shaped William's outlook on life when he was younger due to his bravery.

Learn more about William and his father:brainly.com/question/4066623

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2 years ago
A 75Kg man jumps from a window 1.0m above the sidewalk. If the man falls with his knees and ankles locked, the only cushion for
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Answer:

150153.06122 N

Explanation:

m = Mass of person = 75 kg

h = Height of fall = 1 m

g = Acceleration due to gravity = 9.81 m/s²

F = Force

s = Displacement = 0.49 cm

Potential energy is given by

P=mgh\\\Rightarrow P=75\times 9.81\times 1\\\Rightarrow P=735.75\ J

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W=Fs\\\Rightarrow F=\frac{W}{s}\\\Rightarrow F=\frac{735.75}{0.0049}\\\Rightarrow F=150153.06122\ N

The average force exerted is 150153.06122 N

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