Which statements about velocity are true? Check all that apply.
O A. The symbol for velocity is v.
B. To calculate velocity, divide the change in the distance by time.
O C. The SI units of velocity are m/s.
O D. For velocity, you must have a number, a unit, and a direction.

Ammonium perchlorate nh4clo4 is the solid rocket fuel used by the u.s. space shuttle. it reacts with itself to produce nitrogen gas n2 , chlorine gas cl2 , oxygen gas o2 , water h2o , and a great deal of energy. what mass of nitrogen gas is produced by the reaction of 2.1g of ammonium perchlorate?