2-d Problem

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


The vector position of a particle varies in time according to the expression r = (7.40 i - 6.60t2 j) m.
(a) Find expressions for the velocity and acceleration as functions of time. (Use t, i, and j as necessary.)
v =
a =
(b) Determine the particle's position and velocity at t = 2.00 s.
r =
v =


Homework Equations


kinematic of 2-dimen
r= v/t

The Attempt at a Solution


I found (b) r.. but i have no clue how to start part (A), i thought since R = V/t then
r =(7.40i - 6.60t^2)/ t but that was wrong.. so I'm thinking that r should be change into something. Any help would be great
 

Answers and Replies

  • #2
LowlyPion
Homework Helper
3,097
5
What is the definition of Velocity and Acceleration with respect to distance and time?
 
  • #3
r/t is average velocity. your trying to find the instaneous rate of change. which means its time to put that calc 1 to use!
 

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