Does anybody know this one?

second and third class levers both have
a.
the fulcrum between the effort and load
b.
effort applied in the same place
c.
two loads and fulcrums
d.
the fulcrum at one end of the lever

Adog begins walking at a speed of 6 kilometers per hour. after 1 hour, the dog is walking at a speed of 4 kilometers per hour. which is this an example of? a. positive acceleration b. negative acceleration c. speed