- #1
wcwcaseman
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Homework Statement
The position of a 5kg particle moving in the x-y plane varies as a function of time according to the expression
r = [(3t + 1)m]i + [(-4t^2 +5t + 2)m]j
(r is a vector I just didn't know how to make the arrow over head)
Find the kinetic energy of the particle as a function of time
Homework Equations
k = 1/2 mx+b
The Attempt at a Solution
d/dx r = [(3t + 1)m]i + [(-4t^2 +5t + 2)m]j
v = 3i + (-8t +5)j
v =(3i^2 + (-8t +5)j^2)^(1/2)?
.........
3t+1 = 0
t= 1/3 for x
-4t^2 +5t + 2
t= -.44 or t= 1.69 for y??
Very confused don't know what vector r is. Is it already a function of time or what. I'm very confused and don't understand how to solve please help