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Answer: The acceleration of 10 kg object is greater than that of 18 kg object.

Explanation:
According to Newton's Second law:
F = ma --- (A)

Let's find the acceleration for both 10 kg and 18 kg objects!
The net force on both of these masses = F = 20N

(1) Acceleration of 10 kg object
Mass = m = 10 kg
Plug in the values in equation (A):
20 = 10 * a
Acceleration = a = 2 m/s^2

(2) Acceleration of 18 kg object
Mass = m = 18 kg
Plug in the values in equation (A):

20 = 18 * a
Acceleration = a = 1.11 m/s^2


2 > 1.11; therefore, 10 kg object has the higher acceleration compared to the acceleration of the 18 kg object.

Explanation:

The expression of the applied force in terms of mass and acceleration by using Newton's second law is as follows;

F= ma

Here, m is the mass of the object and a is the acceleration of the object.

Calculate the acceleration of a 10 kg object acted upon with net force of 20 N in the above expression.

Put m= 10 kg and F= 20 N in the above expression.

20= (10)a

a= 2 m/s^2

Calculate the acceleration of a 18 kg object acted upon with net force of 20 N in the above expression.

Put m= 18 kg and F= 20 N.

20= (18)a

a= 1.11 m/s^2

Therefore, the acceleration of a 10 kg object acted upon with net force of 20 N is greater than the acceleration of a 18 kg object acted upon with net force of 20 N.