Question

Between velocity and speed which parameter depend on time and why? Explain.​

Answer 1

The reason is simple. Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object's movement. Put another way, speed is a scalar value, while velocity is a vector.

Answer 2

Explanation:Newton’s second law of motion:

The acceleration of an object is directly proportional to the force acting on it and inversely proportional to its mass.

Simply put, Force causes an object to accelerate, while the object’s mass resists acceleration.

Velocity:

The amount of motion normalized to time is defined to be the velocity of the object. It is thus the displacement of the object divided by the time required to make the displacement. [The object in Tissue Tracking Echocardiography (TTE) is mainly a single point or a Region of Interest (ROI).] Hence, its unit is cm/s.

Velocity is used to describe how fast the myocardium moves in a particular direction. During systole myocardium travels towards apex and velocities are positive in nature. During diastole heart muscle moves to its initial position and diastolic velocities are negative. Displacement is the measure defining how far a myocardial segment moves from an initial point. In fetal echocardiography, its unit is mm and indicated positively.

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