There would be a 1.4142g force directed aft and downward at a 45O angle. It would feel the same as someone piloting a jet plane flying level to the ground on earth subjected to a jet thrust of 1g. Moving around unaided would be fairly difficult - you would want to be strapped-in to an acceleration couch unless you had gravitic assistance from a grav-belt.
So imagine being 40% heavier and trying to move around carrying the extra weight. Or lifting something that has a weight 40% more than than it's mass.
My body armour and helmet, with ammo & all the other accoutrements attached, comes in at 25kg, add in weapon and other items of kit and I'm up to 30kg, or 32% for me. That took a bit of work and training to be able to move around in effectively at my age. The young guys out here however, wearing it every day at work as that's their job, are pretty agile in it. So while it's a bit of work, it's not impossible.
So an extra 40%? With sufficient and regular training a crew would be able to manage that with what I reckon would be minimal impact on their performance. That could be part of a regular ship crew fitness and effectiveness program and testing regime.