Abdul launches a rocket straight up into the air The table below gives the height H t of the rocket in meters few times t in seconds during its flight Time t seconds 0 2 8 5 6 8 4 11 2 Height H t meters 0 84 140 42 0 a Find the average rate of change for the height from 0 seconds to 5 6 seconds meters per second b Find the average rate of change for the height from 8 4 seconds to 11 2 seconds meters per second E