The definitions of mass and speed are as follows:
Mass: Mass is a fundamental property of matter that measures the amount of substance in an object. It represents the resistance of an object to changes in its motion and is often considered a measure of its inertia. The standard International System of Units (SI) unit for mass is the kilogram (kg).
Speed: Speed is a scalar quantity that measures how fast an object is moving. It is defined as the distance traveled per unit of time. The SI unit for speed is meters per second (m/s).
Now, regarding the question about an object with zero mass and infinite speed, it's important to understand that according to our current understanding of physics, objects with zero mass, such as photons (particles of light), can indeed travel at the speed of light in a vacuum (approximately 299,792,458 meters per second).
However, it would not be accurate to say that an object with zero mass would have "infinite" speed if pushed by a force. The concept of infinite speed is not supported by our understanding of physics. As an object approaches the speed of light, its energy and momentum increase significantly, making it more and more difficult to accelerate further. In fact, as an object with mass approaches the speed of light, its energy requirements would become infinite, making it impossible to reach or exceed the speed of light.
For an object with zero mass, such as a photon, it travels at the speed of light because it does not experience the same constraints as objects with mass. The behavior of massless particles, like photons, is governed by the principles of special relativity, which allow them to move at the maximum speed in the universe. However, this does not imply that they can achieve infinite speed or that objects with zero mass can be pushed to infinite speeds.