A change in the termal energy of a substance can lead to a change of state. For example, when heat is added to a solid, its particles move . faster • the same speed • slower • closer together Please Help.

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.

Newton's first law describes something special that results from the sum of all the external forces (including gravity) on an object.