An IC vibration sensor has a range of 5 g and a sensitivity of 400 mV/g. The signal-conditioning circuit for this sensor gives an output of 2.65 V at 0 g. For positive acceleration, the output increases above 2.65 V, and for negative acceleration, the output decreases below 2.65 V. Determine the actual acceleration if the sensor output is a) 2.0 V or b) 3.8 V