Acar travels in a straight line for 4.4 h at a constant speed of 81 km/h. what is its acceleration?

The softest and hardest minerals are: softest hardest

The flame produced by the burner of a gas (propane) grill is a pale blue color when enough air mixes with the propane (c3h8) to burn it completely. for every gram of propane that flows through the burner, what volume of air is needed to burn it completely? assume that the temperature of the burner is 195.0°c, the pressure is 1.05 atm, and the mole fraction of o2 in air is 0.210.

How to know which equation of motion to use where?explain