Dumb question. A heavier aircraft should be slower to accelerate. Given that these planes were at least 13% heavier than was thought and the force applied durin

Dumb question. A heavier aircraft should be slower to accelerate. Given that these planes were at least 13% heavier than was thought and the force applied during takeoff is known, shouldn’t there have been some kind of alarm? “We think you should be going 120 mph but you’re actually going 100 mph”. And based on the inferred mass, can’t you directly calculate what the takeoff velocity should be?