Uniform accelerated motion

  • Thread starter lvck
  • Start date
  • #1
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Homework Statement



1. A train moving at a speed of 30 m/s slows down to 10m/s in 30s. How far had the train gone before it's speed was reduced from 30m/s to 20 m/s?

Homework Equations



D= Vi times T + at(squared) divide it by 2

The Attempt at a Solution


None yet. Please help me with the solution
 

Answers and Replies

  • #3
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Honestly im having a hard time figuring out what the initial velocity is.. and the acceleration
 
  • #4
LowlyPion
Homework Helper
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You can figure the "a" simply by using the relationship that ΔV = a*t That Δ v is (10 - 30) = -20 = a*t

Using the V2 = ... formula then your final speed is 10 m/s and you Initial is 30 and your acceleration is negative because it's slowing you down to 20, then you can figure x.
 

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