Q13 A depth of 10 m of water exerts the same amount of pressure as the entire Earth's atmosphere which is ~120 km thick. Suggest why.

It is either a  proton or a neutron im almost positive. hope this .

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.