Hmm, well it looked pretty easy before because we serendipitously
knew the time t when 
. But we don't
know it now, so how can we solve the problem? Maybe
we can figure out t when v = 5 m/s?
So now we have a sub-problem that'll help us solve the main one:
,
a constant acceleration of 
, at what time
is the
final velocity 
?
To solve this we want an equation relating the
quantities v, 
, a and t. Can you find
such an equation? Sure, you already used it, its
eq. 3.11 . We just need to solve this
for t.
Fine, we solved this sub-problem, now we know t. So we have a problem just like the first camel example, section 3.3.3, except now we want to know the position of the camel when the stop watch reads 1s, instead of 2s.
Following the same logic as in the solution to that example (3.3.5),
