Delta v and change in velocity

• Miraj Kayastha
In summary, the change in kinetic energy for an object of 5 kg that changes its velocity from 5 m/s to 4 m/s is +22.5 J. This is determined by finding the difference between the final and initial kinetic energies, and since the velocity decreases, the kinetic energy also decreases.
Miraj Kayastha
If the velocity of the object of 5 kg changed from 5 m/s to 4 m/s. Then is the change in kinetic energy -22.5 J or +22.5J.

doesn't change mean final velocity minus initial velocity?

Last edited:
Miraj Kayastha said:
If the velocity of the object of 5 kg changed from 5 m/s to 4 m/s. Then why isn't the change change in kinetic energy -22.5 J. The correct answer is +22.5J.

doesn't change mean final velocity minus initial velocity?

This is vague. This is obviously from a HW/Coursework question, which you are not telling us. The "change" depends on the OBJECT IN QUESTION. Is this really the change in KE of the object that slowed down, or the change in KE of another entity that absorbed this energy change? Without you giving us the full picture, we can't tell.

If this is related to school work, please continue by presenting the full question, and what you have attempted, in the HW/Coursework forum.

Zz.

Miraj Kayastha said:
If the velocity of the object of 5 kg changed from 5 m/s to 4 m/s. Then is the change in kinetic energy -22.5 J or +22.5J.
Well, does the KE of the object increase or decrease?

doesn't change mean final velocity minus initial velocity?
Change in any quantity generally means 'final value' - 'initial value'.

What is delta v and change in velocity?

Delta v, also known as Δv, is a measure of the change in velocity of an object. It is commonly used in space travel to describe the change in velocity required to move from one orbit to another. Change in velocity refers to the difference between an object's initial velocity and its final velocity.

What units are used to measure delta v and change in velocity?

In the International System of Units (SI), delta v and change in velocity are measured in meters per second (m/s). However, in space travel, delta v is often measured in kilometers per second (km/s) due to the large distances involved.

How is delta v and change in velocity calculated?

Delta v is calculated using the Tsiolkovsky rocket equation, which takes into account the mass of the object, the exhaust velocity of the propulsion system, and the amount of propellant required for the change in velocity. Change in velocity can be calculated by subtracting the initial velocity from the final velocity.

What factors can affect delta v and change in velocity?

Several factors can affect delta v and change in velocity, including the mass of the object, the efficiency of the propulsion system, and external forces such as gravity and atmospheric drag. The specific mission requirements, such as the desired orbit and payload, will also impact the required delta v and change in velocity.

What are some real-life applications of delta v and change in velocity?

Delta v and change in velocity are crucial concepts in space travel and orbital mechanics. They are used to plan and execute missions to other planets, satellites, and other objects in space. They are also important in designing and controlling spacecraft and satellites in orbit. Additionally, delta v and change in velocity play a role in understanding and predicting the motion of celestial bodies in the universe.

• Mechanics
Replies
3
Views
993
• Mechanics
Replies
9
Views
997
• Mechanics
Replies
13
Views
1K
• Mechanics
Replies
12
Views
515
• Mechanics
Replies
3
Views
391
• Mechanics
Replies
3
Views
1K
• Mechanics
Replies
53
Views
3K
• Mechanics
Replies
4
Views
334
• Mechanics
Replies
13
Views
1K
• Mechanics
Replies
34
Views
3K