No. A blunt object will be blunt regardless of the speed it travels.
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Acceleration is an increase in change in speed over time of an object, and deceleration is a decrease in the change in speed over time of an object. -aerol-
Acceleration is the increase in speed from one unit of time to the next, so the described object has no acceleration. Its speed is constant.
No. It is the change in velocity (not speed) during a given interval of time. It can be an increase or a decrease although a decrease is also called a deceleration.The distinction between velocity and speed can best be illustrated by an object going round in a circle at a constant speed. It is changing direction all the time so that its velocity is constantly changing. It is constantly accelerating even though it is travelling at constant speed.
Velocity is the vector form of speed. It is the speed of an object in a specified direction.
Speed