at a track and field meet, the best long jump is 8m. the jumper took off an angle of 31 degrees to horizontal. what was the initial speed

490 n  f=125n a=2.5m/s2

The boat's velocity relative to the riverbank can be resolved into two components. the component going north is 2.7 m/s and the component going west is 1.2 m/s.we add these two vectors and then find the magnitude of the resultant to get the speed.the magnitude of the resultant vector from adding can be obtained by the pythagorean theorem.    to two significant figures, the boat's speed relative to the riverbank is 3.0 m/s.

Iwould think it would be efficiency.