A quarterback back pedals 2.5 meters northward and then
runs 6.8 meters southward.

The travels is 9.3 and displacement of 4.3 meters

Explanation:

The computation of distance and displacement is shown below:-

Distance = Northward meters + Southward meters

= 2.5 meters + 6.8 meters

= 9.3 meters

Displacement= Final - Initial distance

= 6.8 meters - 2.5  meters

= 4.3 meters

Direction→southward

Here direction is going towards the southwards as southwards distance in higher than the northward distance of displacement is southward.

the second one and the forth one are in the purple because they are opinions and the rest are in the yellow

explanation:

in simple terms, the principle states that the buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g. this is also known as upthrust.