FREE FLOAT AT ACTIVITY J

Here activity J is on non critical path and if slip by 2 weeks with its early finish date, will not affect the successor activity G, hence free float is only at activity J in this example of 2 weeks.

FLOAT OF ACTIVITY C IS 14 DAYS

Total float also called Float., can occur at non critical path only.
Free float , as per definition , will not affect the early start of successor activity, hence it will not occur at activity c or at any activity in this example.