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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