Help with decelleration, acceleration and time

In summary, deceleration is the rate of decrease in velocity over time and is also known as negative acceleration. It differs from acceleration, which is the rate of increase in velocity over time. The factors that affect deceleration include initial and final velocity, time, air resistance, friction, and the mass of the object. Deceleration can be negative, meaning the object is slowing down in the opposite direction of its initial motion. Time is directly related to both deceleration and acceleration, with a longer time resulting in smaller changes in velocity and a shorter time resulting in larger changes in velocity.
  • #1
djszkoda
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0
delete please.
 
Last edited:
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  • #2
Hi, welcome to PF.

You need to use [tex]v^{2}-u^{2}=2as[/tex] where u is the initial velocity, v the final, s is the displacement and a is the acceleration. From this you can find s and then find t.
 
  • #3
You have everything you need.

Imagine two trains running together on parallel tracks. One slows down, stops for a while and then accelerates back to cruising speed. The other one is now a good way ahead. What you have to find is the time separation between these two trains as they pass through the next station without stopping.
 

1. What is deceleration?

Deceleration is the rate of decrease in velocity over time. It is also known as negative acceleration.

2. How is deceleration different from acceleration?

Acceleration is the rate of increase in velocity over time, while deceleration is the rate of decrease in velocity over time.

3. What factors affect deceleration?

The factors that affect deceleration include the initial velocity, the final velocity, and the time taken to change velocity. Other factors may include air resistance, friction, and the mass of the object.

4. Can deceleration be negative?

Yes, deceleration can be negative. Negative deceleration, also known as negative acceleration, occurs when an object is slowing down in the opposite direction of its initial motion.

5. How is time related to deceleration and acceleration?

Time is directly related to both deceleration and acceleration. The longer the time taken for a change in velocity, the smaller the acceleration or deceleration will be. Similarly, a shorter time for the same change in velocity will result in a larger acceleration or deceleration.

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