Determine the magnitude of the acceleration for the speeding up phase.

Determine the magnitude of the acceleration for the speeding up phase. Express your answer to two significant figures and include the appropriate units. I've tried 2.8 m/s^2, and 1.1 m/s^2, but they are both wrong. Determine the magnitude of the acceleration for the slowing down phase.

The horse latitudes-high-pressure zones about 30 degrees north and 30 degrees south of the equator.-warm air traveling away from the equator cools and sinks-weather tends to be clear and drythe doldrums-low-pressure near equator-air rises and spreads out toward the poles-rising moist air produces clouds and heavy rainthe westerlies-blow from the west-move from the horse latitudes toward the poles.-bring storms across much of the united statesthe tradewinds-blow from the east-move from the horse latitudes toward the equator  -strong, steady winds

490 n  f=125n a=2.5m/s2