science

A particle starts from the origin with a velocity of 10 m/s and moves with a constant acceleration till the velocity increases to 50 m/s. At that instant the acceleration is suddenly reversed. What will be the velocity of the particle, when it returns to the starting point?

asked by ASSIGNMENT
  1. avg velocity =30m/s
    vf^2=vi^2+2ad
    2500=100+2a d or d=1200/a

    So new issue: we apply -a to stop it first.
    vf=vi+at=50-a*t or t=50/a to stop.
    it now has went a second distance of
    vf^2=Vi^2+2ad
    0=50^2-2a d or
    d=1250/a+1200/a

    now on the return trip from the max total distance to the original position
    vf^2=vi^2+2ad
    vf^2=2(-a)(-1250/a-1200/a(
    vf^2=2*2450
    vf=sqrt(4900( =70m/s in the opposite direction of the original 10m/s
    check my math.

    posted by bobpursley

Respond to this Question

First Name

Your Response

Similar Questions

  1. physics

    A body starts with an initial velocity of 10m/s and moves along a straight line with a constant acceleration. When the velocity of the particle becomes 50 m/s the acceleration is reversed in direction without changing magnitude.
  2. math

    Which three options are true about motion in a straight line. A. A particle which moves at an increasing velocity has a constant acceleration. B. If two particles always have the same velocity as each other, their separation does
  3. maths

    Which three options are true about motion in a straight line. A. A particle which moves at an increasing velocity has a constant acceleration. B. If two particles always have the same velocity as each other, their separation does
  4. math

    Which three options are true about motion in a straight line. A. A particle which moves at an increasing velocity has a constant acceleration. B. If two particles always have the same velocity as each other, their separation does
  5. physics

    A particle starts from the origin with a velocity of 6.0 i m/s and moves in the xy plane with a constant acceleration of (-2.0i + 4.0j)m/s^2 . at he instant the particle achieves maximum positive x-coordinate, how far is it from
  6. Physics

    A particle starts from the origin at t = 0 and moves along the positive x axis. A graph of the velocity of the particle as a function of the time is shown in the figure; the v-axis scale is set by vs = 7.0 m/s. (a) What is the
  7. Physics

    A particle leaves the origin with a velocity of 7.2 m/s in the positive y direction and moves in the xy plane with a constant acceleration of (3.0 – 2.0 ˆi ˆj ) m/s2. At the instant the particle moves back across the x axis (y
  8. Urgent physics help

    1. A runner starts at rest and accelerates uniformly at a rate of 0.85 m/s2 . What is the runner’s velocity after the runner has traveled 6.0 m? A. 2.3 m/s B. 3.2 m/s C. 5.1 m/s D. 10.2 m/s 2. An official drag race in the United
  9. Physics 221

    1. throughout a time interval, while the speed of a particle increases as it moves along the x axis, its velocity and acceleration might be: A. positive and negative, respectively B. negative and positive, respectively C. negativa
  10. Physics

    An object moves in a circular path with constant speed. Is the object's velocity constant? Is its acceleration constant? Please explain. From what I've learned in my 8th grade science class, when velocity changes is when the

More Similar Questions