Until a train is a safe distance from the station, it must travel at 5 m/s. Once the train is on open track, it can speed up
to 45 m/s. If it takes a train 8 seconds to reach 45 m/s, what is the acceleration of the train?
m/s2
Done

If your workout exceeds an hour you should substitute "a sports drink" for water.hope my answer has you : )

The fertilized egg  begins to develop into a hollow ball of cells called the blastocyst. 

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.