Besides seeing in the dark, night vision goggles/cameras are used by the fire department to see through .

If football was tossed in air without gravity or friction the ball would go into space

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.

Answer/guglielmo marconi

Ithink the answer is 6.0