What Is the Correct Way to Calculate Unbalanced Force?

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The correct way to calculate unbalanced force is through Newton's second law, expressed as F = ma, where F is the force, m is the mass, and a is the acceleration. In this discussion, the user provided specific values: mass (m) of 1500 kg and acceleration (a) of 1.8 m/s². The user incorrectly attempted to use the formula F = ma/t, which is not valid for calculating force. The correct calculation yields a force of 2700 N (1500 kg * 1.8 m/s²).

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I am trying to work out question two on this page: http://www.bbc.co.uk/apps/ifl/scotland/learning/bitesize/higher/physics/quizengine?ContentType=text%2Fhtml%3Bcharset%3Dutf-8;templateStyle=physics;quiz=forces

m = 1500
a = 1.8
u=0
tacc = 0.5
tcon = 8.5
tres = 0.5

But I can't seem to get the right answer at all.

I have tried F=ma/t and searched for examples but I'm totally stuck.
 
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Where did you get F=ma/t?

Perhaps you might show your work on this.
 

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