Calculating Motor Load Capacity for a 4kg Vehicle

[nat360]

TL;DR Summary: I need help with calculating how much a motor will be able to pull.

Hi all, I am currently in my first year of engineering and we have a project which requires us to use motors to drive a 4kg max vehicle. I was planning on using the very common yellow DC motors which have arduino compatibility. However I am unsure of if it is powerful enough to pull this load. Below I have listed the specifications:
Operating Voltage
3V-12VDC

Maximum Torque
800g/cm max. @ 3V

Gear Ratio
1:48

Load Current
70mA (250mA max. @ 3V)

It would be greatly appreciated if someone could explain how to calculate the mass it will be able to hold and move.

 

[Baluncore]

Please identify the type of DC motor, and provide a link to the motor technical data.

 

[jack action]

The power of the motor (less inefficiencies of the drivetrain) should be equal to the power required by your vehicle.

So you have to first identify the power requirement of your vehicle. A mass of 4 kg is not power. What are the forces acting on that 4 kg mass and at what velocity? (Power = Force X Velocity)