If you’re on final approach with a reasonable headwind in a 150, put 40 degree flap on and you’re flying a Harrier !
i have had to go round with 40 degree flap a few times, the most memorable was two up, when some cretin pulled onto the runway and started a slow takeoff run when I wasn’t far from touching down. Treat the elevator gently and it will climb away , very slowly
in that situation the other advantage of the 150 (mine’s a model L from 1973) is that the flap lever can be used gradually, it doesn’t have to move in ten degree notches