No, the statements you mentioned are not accurate.
Uniform velocity refers to a constant velocity, which means the object is moving in a straight line with a constant speed. It does not change over time. The formula for calculating displacement with uniform velocity is:
Displacement = Velocity × Time
Instantaneous velocity refers to the velocity of an object at a specific instant in time. It is the limit of the average velocity as the time interval approaches zero. Instantaneous velocity is not multiplied by time.
Similarly, uniform acceleration refers to a constant rate of change of velocity. It means the object's velocity changes by the same amount in each unit of time. The formula for calculating displacement with uniform acceleration is:
Displacement = Initial Velocity × Time + (1/2) × Acceleration × Time^2
Instantaneous acceleration refers to the acceleration of an object at a specific instant in time. It is the limit of the average acceleration as the time interval approaches zero. Instantaneous acceleration is not multiplied by time.
In summary, uniform velocity and uniform acceleration are not defined by multiplying instantaneous velocity or acceleration by time. They have specific meanings in terms of constant values over time or change in velocity over time.