Which description includes a scalar quantity? the car is moving at 70 miles/hr. objects accelerate on earth at 9.8 m/s2 downward. the plane is flying west at 850 miles/hr. the box moved 20 meters to the left.

Car moving at 70 miles per hour

Explanation:

A scalar is a quantity that can be fully described by magnitude alone.

Examples of scalar quantities include: Distance and speed

Something is not a scalar quantity when it is given direction. When this happens, it becomes a vector quantity.

Thus, from the choices, we can see that the car moving at 70 miles per hour is the scalar quantity as it is the only choice without a direction.