A roller coaster car rapidly picks up speed as it rolls down a slope. As it starts down the slope, its speed is 3 m/s. But 2.5 seconds later, at the bottom of the slope, its speed is 25 m/s. What is its average acceleration?

Average acceleration = 8.8 m/s²

Explanation:

Given the following data;

Initial velocity = 3m/s

Final velocity = 25m/s

Time = 2.5 secs

To find the average acceleration;

Acceleration = v-u/t

Acceleration = 25 - 3/2.5

Acceleration = 22/2.5

Acceleration = 8.8 m/s²

Therefore, the average acceleration is equal to 8.8 meters per seconds square.

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask