A cart moves along a 2-dimensional (i.e. not straight-line) path
with its position in the x- and y- directions given by
x(t) = (45 m) + (6 m/s2) t2
y(t) = 3m + (-3 m/s2) t2
a) What is the velocity in the y-direction at time t=2 seconds
(a number, with units)?
b) What is the speed of this object at time t=2 seconds (a
number, with units)?
c) Does this object have a constant acceleration? (For full
credit, you must explain how you can tell)...