Glasgow Helo Crash
On the evidence so far available, it would appear the chopper went down in a straight vertical descent, meaning it had virtually NIL horizontal velocity. Assuming a weight of 2.5t a descent from 300m,and an intial impact absorption/stopping distance of 5m, the dynamic impact force would have been close to 150tons. To put it another way, a weight increase of 60 fold. With a frontal area of say 4 sq.m., this would have equated to an impact force of nearly 40tons per square meter.
Perhaps this helps to explain the apparent damage to the roof of the building and the disposition of the wreckage.