What Is the Correct Way to Calculate Unbalanced Force?

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To calculate unbalanced force, the correct formula is F = ma, where 'm' is mass and 'a' is acceleration. In this case, with a mass of 1500 kg and an acceleration of 1.8 m/s², the force can be calculated as F = 1500 * 1.8. The user expressed confusion regarding the formula F=ma/t and sought clarification on its validity. Additional assistance was requested to demonstrate the calculation process for better understanding.
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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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