Which of the following would likely be the best reflector of heat energy

Will you chech and finish these for me, because i am stumped with them.

It can take some of those large , industrial vehicles up to feet to stop when traveling only 60 mph, and therefore , you shoukd be mindful to not be jn the traffic right in front of them a. 100 feet b. 200 feet c. 335 feet d. 425 feet

Dao makes a table to identify the variables used in the equations for centripetal acceleration. what quantities belong in cells x and y?