Which description includes a vector quantity?
a the car is moving at 70 miles/hr.
b the car's velocity changes at 9.8 m/s2.
c the plane is flying at 850 miles/hr.
d the box moved left 20 meters.

D The box moved left 20 meters.

Explanation:

Let's start by explaining that a vector is one that has a numerical value along with its units (called a module) and a direction, while a scalar is only determined with a number and its corresponding units, without direction.  

Then, if we are given a quantity with only a numerical value along with its units we will have a scalar, and when we have a quantity with its numerical value along with its units and also the direction is given, we will have a vector.

So, according to this explanation, the only option that fullfils the conditions of a vector is D:

The box moved left 20 meters.

Because we have a numerical value (20) with ist units (meters) and its direction (to the left).

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.

the answer to this is proletariats.

hope this : )