Your 'cq_1_11.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
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Answer the following based on Newton's Second Law:
How much net force is required to accelerate a 12 kg mass at 3 m/s^2?
Fnet = 12kg*3m/s^2 = 36N
What would be the acceleration of a 4 kg mass subject to a net force of 20 Newtons?
a= 20N/4kg = 5m/s^2
If you exert a force of 20 Newtons on a 10-kg object and it accelerates in the direction of your force at 1.5 m/s^2, then how do you know there are other forces acting on the object besides your own?
&&&&The force needed to move the 10kg object is 1.5m/s^2 * 10kg = 15N
&&&&That means we have a force of 5N in the opposite direction of the force we are exerting, therefore, -5N. 15N - -5N = 20N needed to move the object. The total force is 20N.
Good revision.