The velocity of desmond’s car changes from 20 meters/second to 10 meters/second. the change happens in 5 seconds. what’s the acceleration of the car? use . 4 m/s2 2 m/s2 -2 m/s2 -4 m/s2

- 2 m/s²

Explanation:

Acceleration is the rate of change of velocity with time.

Given,

Initial velocity = 20 m/s

Final velocity = 10 m/s

Time = 5s

Change of velocity = Final velocity - Initial velocity = 10 m/s - 20 m/s =  - 10 m/s

Acceleration = = = - 2 m/s²

Here the minus sign (- 2 m/s²) indicates that the acceleration is actually decreasing. This is because the final velocity is lower than the initial velocity.  

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

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