At a given aerodrome the runway length, pressure altitude and OAT, as well as other data are known, and the flap setting for takeoff is selected to be flaps 10° to get maximum possible takeoff weight at this aerodrome. As the aircraft departs, the flap handle is erroneously set to 20° . Now the takeoff performance:
vs RWY increases
vs climb requirement increases
vs service ceiling increase
vs OBST increases (determined by a distant obstacle)