Question

What can you say about the motion of an object if its speed-time graph is a straight line parallel to the time axis?
A. Object Is moving with uniform acceleration
B. Object Is moving with uniform speed
C. Object Is moving at rest
D. None

Answer 1

The magnitude of the rate of change of an item's position with time or the magnitude of change of its position per unit of time is the speed (often referred to as v) of an object in daily use and in kinematics; it is therefore a scalar number. The average speed of an object in a given time interval is the item's distance travelled divided by the period's duration; the instantaneous speed is the average speed's limit as the interval's duration approaches zero.

Complete step by step solution:
We know that the magnitude of the velocity at a given moment is the speed at that time. As a result, we may use equations of motion to create speed-time graphs. The speed time graph, with the Y-axis representing speed and the X-axis denoting time, will look like this when the speed is constant:

The speed remains constant (c) throughout the time span, as seen in the graph. The speed will always remain c, regardless of how much time passes. Example: If a particle's acceleration is zero (0) and its speed is constant, say 5 m/s at t = 0, the particle's speed will remain constant throughout time.
The object is travelling at a constant speed when the slope of a speed-time graph is a straight line parallel to the time axis. The object is considered to be in uniform motion since its velocity (Y-axis value) does not change at any point in time (X-axis value). If an object's speed-time graph is a straight line parallel to the time axis, it is said to be moving. Because the item's speed does not change over time, the thing moves in a consistent manner. As a result, the item is travelling at a constant rate.

Note:
When describing the movement of an item, speed-time graphs are quite useful. They may be used to determine whether an object is moving or not at any given time. They may also be used to determine the speed at which an object is moving at any given time. We can compute any acceleration, change in speed, and change in time using data from the graph. We can also utilise graphs to figure out how far we've travelled. The distance travelled is represented by the area beneath a speed-time graph.