What is the density of mass=40g volume=20ml

The density of a substance is 2 g/mL

Explanation:

To calculate the mass of solution, we use the equation:

We are given:

Mass of a substance = 40 g

Volume of a substance = 20 mL

Putting values in above equation, we get:

Hence, the density of a substance is 2 g/mL

what is the average time it took the car to travel 0.25 meters?

⇒ 2.23 seconds

what is the average time it took the car to travel 0.50 meters?

⇒ 3.13 seconds