Force = Mass × Acceleration
where Force N = kg·m/s²
Derive Mass formula:
Force/Acceleration = (Mass × Acceleration) / Acceleration
Mass = Force / Acceleration
Since Acceleration = Velocity/Time
Mass = Force / (Velocity/time)
Mass = (3,000 kg ·m/s²) / [(15 m/s) ÷ 10 s]
Mass = (3,000 kg·m/s²) / (1.5 m/s²)
Mass = 2,000 kg.
ANSWER: The car's mass is 2,000 kg.
CLICK the image below to view the complete solution and how the it progresses, i. e., how the units of measure are cancelled to reach the required unit for mass.