To calculate the acceleration of an object, you can use Newton's second law of motion, which states that the force acting on an object is equal to the product of its mass and acceleration: F = ma.
In this case, the object has a mass of 10 kg and is subjected to an additional force of 20 N (not 20 J, as J represents energy, not force). Therefore, we have F = 20 N and m = 10 kg.
Rearranging Newton's second law, we can solve for acceleration:
a = F/m
Plugging in the given values:
a = 20 N / 10 kg = 2 m/s²
Hence, the acceleration of the object is 2 m/s².