I really don't get this question

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Homework Help Overview

The discussion revolves around a problem involving the final velocity of a supersonic jet that is being uniformly accelerated. The context includes basic kinematics concepts, particularly focusing on acceleration and its relationship with velocity.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants explore the definition of acceleration and its mathematical expression. There is an attempt to apply kinematic equations, but questions arise regarding the absence of distance in the given problem.

Discussion Status

The discussion has progressed with participants providing guidance on the definitions and equations related to acceleration and velocity. Some participants have expressed understanding of the concepts, while others are still clarifying their thoughts.

Contextual Notes

There is a noted lack of distance information, which is impacting the application of certain kinematic equations. The participants are navigating through the foundational concepts of the topic.

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Homework Statement



A supersonic jet flying at 160 m/s is being
accelerated uniformly at 23.7 m/s for 20 s.
What is its final velocity?
Answer in units of m/s

Homework Equations


V(final) = V(initial)^2 +2ad. Well that's what I tried using but we just started this topic and I am not sure at all.




The Attempt at a Solution

 
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weesieman said:
V(final) = V(initial)^2 +2ad. Well that's what I tried using but we just started this topic and I am not sure at all.
Since you don't have distance, that won't help. But what's the most basic definition of acceleration?
 
The rate that velocity changes
 
weesieman said:
The rate that velocity changes
Good. Express that mathematically.
 
v=d/t
 
weesieman said:
v=d/t
That's velocity. What about acceleration?
 
oh right I think i got it. vf-vi/t
 
weesieman said:
oh right I think i got it. vf-vi/t
Good! a = (vf - vi)/t.

So, reverse that around and solve for vf.
 
  • #10
thanks i got it
 

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