What is the composition of the black powder in a firework?

Black powder. Black powder, also called gunpowder, is an explosivemixture of sulfur, charcoal and potassium nitrate, KNO3 (also known as saltpetre/saltpeter) that burns rapidly, producing volumes of hotsolids and gases which can be used as a propellant in firearms and as apyrotechnic composition in fireworks.

it's all four options.

for step 7 table c on the lab "newtons law of action"   the average time it took the car to travel .25 meters   was 1.92 seconds.

the average time it took the car to travel 0.50 meters was 2.61 seconds

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