What is the displacement?

  • Thread starter TheGeek
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  • #1
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Homework Statement


A). A particle starts from rest and moves for 10 s with an acceleration of 2 m/s^2.
B). For the next 20 s, the acceleration of the particle is -1.2 m/s^2.
C). What is the displacement of the particle at the end of the 30 s.

2. Homework Equations

Kinematic equations

The Attempt at a Solution



I was able to find the Displacement of A = 100 m and B = 20 m
However I cant find the Displacement of C because I don't know how to find the last acceleration or V-final

Thank You.
 

Answers and Replies

  • #2
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Draw a graph of the motion and from there you can see how to get the answer.

From part B you can get the velocity needed for part C. Remember vf=at+v0 where v0 is from part A
 
  • #3
haruspex
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B = 20 m
How did you get that?
From part B you can get the velocity needed for part C
Did you mean "From part A you can get the velocity needed for part B"?
 
  • #4
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Yes, it's a chained problem right? So the results of A with ##v_{Afinal}## and ##d_{Afinal}## are inputs to part B. and the results of ##v_{Bfinal}## and ##d_{Bfinal}## are inputs to C.
 

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