science
posted by Sarah .
An electron had a constant acceleration of +3.2m/s^2. At a certain instant its velocity is +9.6m/s. What is its velocity at a)2.5 s earlier and b )2.5s later?
I will be happy to critique your work.
I could a= change in velocity / change in time ?
Here's the question:
"An electron had a constant acceleration of +3.2m/s^2. At a certain instant its velocity is +9.6m/s. What is its velocity at a)2.5 s earlier and b )2.5s later?"
a=+3.2m/s^2
(1) v(t)=a*t
You should be able to answer the question with (1)
I suppose we're supposed to have the initial velocity =0, but an electron is never at rest.
so the velocity would be 8m/s for part
and 8m/s for part b?
No, I think the question wants you to suppose that t=3 and that the electron has been accelerated from rest. (That's why I said the question is somewhat imaginary. No electrons are at complete rest.)
The equation v=a*t is a line with slope a; t is the independent variable here.
At t = 3 v=a*t=+3.2*3=+9.6
v=a(t+2.5) 2.5s later
v=a(t2.5) 2.5s earlier
Respond to this Question
Similar Questions

Physics
An object moves in a circular path with constant speed. Is the object's velocity constant? 
Physics Electrical help thanks
Thank you ! At some instant the velocity components of an electron moving between two charged parallel plates are vx = 1.3 105 m/s and vy = 3.6 103 m/s. Suppose that the electric field between the plates is given by E = (120 N/C) j. … 
physics
A football is thrown horizontally with an initial velocity of (16.5 m/s). Ignoring air resistance, the average acceleration of the football over any period of time is (9.81 m/s2). Find the magnitude and direction of the velocity at … 
science
When is the average velocity of an object equal to the instantaneous velocity? 
physics
An electron has a constant acceleration of 2.0 m/s2. At a certain instant its velocity is 10.9 m/s. (a) What was its velocity 2.5 s earlier? 
Physics
A cart has a constant acceleration of a = 2m/s2. At a certain instant its speed is 5 m/s. What is its speed 2 s later and 2 s earlier? 
Science
1.A model train traveling at a constant speed around a circular trak has a constant velocity. True False**** 2.Which of the following would be affected if a soaring eagle changes direction but remained at a constant speed? 
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, … 
shahabdulatif science
the velocity of the body moving in a straight line with a constant acceleration, is 10 m/s at a certain instant 't' . after 5 second the velocity become 20 m/s, the velocity 3 second before 't' was? 
Physics I (Classical)
At some instant, a particle traveling in a horizontal circular path of radius 7.50 m has a total acceleration with a magnitude of 16.0 m/s^2 and a constant tangential acceleration of 12.0 m/s^2. Determine the speed of the particle …