A roller coasters velocity at the top of a hill is 21mls. Two seconds later it reaches the bottom of the hill with a velocity of 36mls. What is the acceleration of the roller coasters

7.5 m/s²

Explanation:

The following data were obtained from the question:

Initial velocity (u) = 21 m/s

Final velocity (v) = 36 m/s

Time (t) = 2 secs

Acceleration (a) =..?

The acceleration of an object is simply defined as the rate of change of velocity of the object with time. Mathematically, it is represented as:

Acceleration (a) = (final velocity (v) – initial velocity (u)) / time (t)

a = (v – u)/t

With the above formula, we can determine the acceleration of the roller coaster as follow:

a = (v – u)/t

a = (36 – 21)/2

a = 15/2

a = 7.5 m/s²

Therefore, the acceleration of the roller coaster is 7.5 m/s².

The salt is barium chloride.

Explanation:

Moles of barium sulfate =

According to reaction, 1 mol of barium sulfate is produced from 1 mol of .

Then 0.0480 moles will be produced from:

of .

Mass of used = 10.00 g

Moles of =\frac{10.00 g}{\text{Molar mass}}[/tex]

Molar mass of = 208.33 g/mol

The nearest answer to our answer is .

The correct answer barium chloride with molar mass of 208.2 g/mol.