Alex is probably right about the checking order getting mixed up.

If his solution doesn't work, try putting the answer checker for the popup immediately after that part of the question. i.e.:

...

d.) Now that we have 3 pieces of information in our vvaxt we can now determine the

remaining pieces. Since we really want to know how far the

bike will travel in the time it takes for the balloon to fall what

we need to calculate is the time (t) that it takes the balloon to

fall to the ground. Which formula will you use to solve for

time?

A.) [: V_f=v_o+at :]

B.) [:v_f^2=v_o^2+2ax:]

C.) [:x=v_o*t = (1/2*a*t^2):]

[@ $popup->menu() @]*

END_PGML

ANS( $popup->cmp() );

BEGIN_PGML

e.) How long will it take the balloon to fall to the ground?

[_____]{$tu}.

...

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