Cars A and B move in the
same direction in adjacent lanes. The position x of car
A is given in the figure, from time t = 0 to
t = 7.0 s. The figure's vertical scaling is set by
xs = 48.0 m. At t = 0, car B
is at x = 0, with a velocity of 18.0 m/s and a negative
constant acceleration aB. (a)
What must aB be such that the cars are
(momentarily) side by side (momentarily at the same value of
x) at t = 4.0 s?