# Kinematic problem

1. Jan 21, 2009

### Dell

a body moves according to the following:
ay=2-4t
ax=-1
vy=2t-2t2
vx=1-t
x0=2
y0=3

what is the tangential acceleration when t=1?
what is the radius of curvature of the motion when t=1?

aT=$$\vec{a}$$dot$$\vec{v}$$/|v|
at t=1, $$\vec{v}$$=0 so there is no tangential acceleration, how can this be true???

the secon part of the question is also not making sence

ar=v2/r, but here v=0 and ar=3 since there is no aT and ax=-1, ay=-2????

2. Jan 21, 2009