Which car is accelerating?
a) a car that is unmoving
b) a car that rounds a curve at a constant speed
c) a car that travels in straight line at a constant speed
d) a car that is set to a constant speed of 60 miles per hour

The correct answer is B) A car that rounds a curve at a constant speed.

Explanation-

Acceleration is defined as a rate of change of velocity. Hence, it is a vector quantity that is it has magnitude as well as direction.

When a car moves along a curve with constant speed, its magnitude of speed remains constant but its direction of motion keeps on changing. The change in its direction leads to an acceleration.

Thus, option B) represents that the car is accelerating.

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.