Why does friction cause transfer of charges

 During a charging by the friction process, the material that becomes negatively charged does so because it simply likes electrons more than the material with which it is rubbed.

Think about how friction functions when a car is trying to make a turn if the car is moving sufficiently slowly, then static friction between the car tire and the road cause's acceleration hope this helps 

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.

2/2m is the answer easy