If its the force you hav to calculate then use the equation F=ma where
F is foce
m is mass
a is acceleration
Therefore F = 1000kg × 3ms^-2 = 3000N
If we use F=m×a or in this case F=1000×3
So this car would need 3000 Newtons to accelerate it, discounting friction since we don't know what the surface is or the coefficient of friction.
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