# What is the displacement?

## 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.

jedishrfu
Mentor
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

haruspex
Homework Helper
Gold Member
2020 Award
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"?

jedishrfu
Mentor
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.