You drop your frozen rock from a green bridge. The frozen rock starts from rest (initial velocity = 0ms). The rock takes 4.3s to hit the water below. The acceleration due to gravity on Earth is 9.8m\s2 s 2 downward. What is the frozen rocks velocity after 1.5 seconds? vf = vi + at

The velocity of the frozen rock at is -14.711 meters per second.

Explanation:

The frozen rock experiments a free fall, which is a type of uniform accelerated motion due to gravity and air viscosity and earth's rotation effect are neglected. In this case, we need to find the final velocity (), measured in meters per second, of the frozen rock at given instant and whose kinematic formula is:

(Eq. 1)

Where:

- Initial velocity, measured in meters per second.

- Gravity acceleration, measured in meters per square second.

- Time, measured in seconds.

If we get that , and , then final velocity is:

The velocity of the frozen rock at is -14.711 meters per second.

vapour or gas assuming atmospheriv pressure

c. newton's third law of motion