Final answer:
To calculate the combined force of the two people pushing the car, you can use Newton's second law of motion. The calculated force assumes that the force is applied evenly by the two people and neglects other forces acting on the car. The real force may differ if there are additional forces, such as air resistance or friction.
Step-by-step explanation:
To calculate the combined force of the two people pushing the car, we need to use Newton's second law of motion, which states that force (F) is equal to mass (m) multiplied by acceleration (a). In this case, the mass of the car is 1000 kg and the acceleration is 3 m/s². Thus, the force exerted by the two people is F = m * a = 1000 kg * 3 m/s² = 3000 N.
Assumptions made in calculating the answer include assuming that the force is applied evenly by the two people and neglecting any other forces acting on the car, such as friction.
The real force from the people needed to produce this acceleration may be different from the calculated answer in part a if there are additional forces acting on the car, such as air resistance or friction. These forces could increase the overall force required to accelerate the car to 3 m/s and make it different from the calculated answer.
Learn more about force, acceleration, Newton's second law of motion