Corrected entry: Johannson states that Mark Whatney's MAV was traveling at 741 m/s and his then altitude was 1350 meters. Then Commander Lewis states this is "too low." This must be too low, as at 741 m/s, he would have past 1350 meters in a little less than 2 seconds instead of the stated 12 minutes from launch to end of burn. This 1350 meters perhaps should have been 1350 km final altitude after the MAV finished its burn. (01:56:45)
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Correction: They are referring to orbital speed, not the speed he is going up. A faster orbital speed means he will be travelling further from the planet. His orbital speed is too low and as a result his orbit is too close to the planet to meet up with Lewis.