The total mass of the man and the bicycle is 85kg.
The mass of the man and the bicycle does not directly affect the speed, as long as the force applied to the pedals is sufficient to overcome the resistance of the combined mass. However, a heavier mass may require more force to maintain a steady speed.
The speed of the bicycle can be calculated by dividing the distance traveled by the time taken to travel that distance. In this case, the speed is 4 meters per second.
Friction plays a crucial role in this scenario as it provides the resistance needed to maintain a steady speed. Without friction, the bicycle would continue to accelerate until an external force, such as air resistance, balances it out.
Yes, this scenario is an example of Newton's First Law of Motion, also known as the Law of Inertia. The man and the bicycle will continue moving at a constant speed in a straight line unless acted upon by an external force.