Answer:
Explanation:
A ) When a person is falling under gravity , he goes close to the earth with acceleration 9.8 m /s² . Here we assume that earth is stationary , though it is not . We can also say that earth is moving towards the person with acceleration 9.8 m /s² . The displacement or movement is a relative measurement . So is acceleration .
So the answer to first question is 9.8 m /s²
B ) Displacement of person in this case towards the earth is equal to height of the chair . Here we assume that earth is stationary , though earth is not stationary . It is constantly moving around the sun. Similarly we can also say that earth has moved towards the person by distance equal to height of the chair , if we consider person to be stationary.