The engine of a boat (m = 1580 kg) exerts a 2200 N force northward, while the current
pushes it 1350 N eastward.
In what direction does the boat accelerate?
[?]°

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )

i think it's 35 meters

the doppler effect is used by weather forecasters to measure 

moving clouds