From where does the pole vaulter get the energy needed to bend the pole and then rise over the bar hurry plz

2.77 x 10^-3 its for plato user 

How are period and frequency related to each other? dperiod is the reciprocal of frequency.

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.