Answer: Its acceleration would decrease.
Step-by-step explanation:
The question is not very clearly worded. A better way to say what they’re really asking is, how would the acceleration of the car be different if it had more mass, given that the same forces were acting on it?
With that caveat in place, we can consider the general equation for force, mass, and acceleration, F = ma. If we solve this for acceleration, we get a = F/m. From this equation and a few sample numbers, we can see that increasing mass decreases acceleration.
Let’s use force = 1 and mass = 1 for our first example. That gives us a = f/m = 1/1 = 1.
If we then double the mass to 2 while keeping the force the same, we get a = f/m = 1/2 = 0.5. This clearly halves the acceleration when the mass is doubled.
I hope from this example you can see that more mass = less acceleration, given the same amount of force.