Answers
The best investigation would be use a different amount of mass in the cart for five different trials, and measure the force needed to start the cart rolling each time.
Speed is not directly impacted by mass. It establishes how quickly an object can increase its speed (accelerate) in response to a specific force. Lighter objects change their speed by a given quantity with a given force in a shorter amount of time.
More mass means that heavier items are more challenging to move and stop. Greater mass in heavier items makes them more resistant to change than lighter ones. A bicycle or a Cadillac can be propelled or stopped once in motion. It is more difficult to start or stop an object the more big it is (has more inertia). Potentially, an object with the same kinetic energy could also be slower and heavier.
Kinetic Energy's formula is KE = 1/2 mv2. Because mass and kinetic energy are directly correlated, an object's kinetic energy rises as mass does. The same may be said for velocity.
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