MOST got this physics question WRONG

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This question proved to be a common mistake on that paper and it shows a great applicatio of Newton's 2nd Law.
This is a question from OCR Modelling Physics 2018 however the physics behind is applicable to all exam boards including AQA, CIE, Eduqas, IB Physics etc.
Please note these are not official solutions, you can find the paper at the exam board's website:
www.ocr.org.uk...
Examiner's report: www.ocr.org.uk...

[@primsiren1740]

I used the method you would usually use in mechanics in maths: Trolley: T=ma Weight: w-T=w/g X a Where T is the tension in the string. Solving simultaneously gives D.

[@zhelyo_physics]

Excellent! : ) Really like that!

[@QuaternionPhysics1]

I solved it using simultaneous equations. Very similar to mechanics style question involving pulleys on tables

[@zhelyo_physics]

Very nice!

[@Tushar-kj5wm]

It's a common problem in Indian high schools

[@zhelyo_physics]

Excellent!

[@alejandracordero7940]

Well done, it’s really easy to understand 😃

[@zhelyo_physics]

Thanks a lot!

[@theaerograndprix]

If your aiming for an A* what marks should you be getting in your past papers

[@zhelyo_physics]

85+

[@Mariannabopassos]

Very Easy problem for Brazilian high schools ...

[@zhelyo_physics]

I am actually working on a video of a hard Brazilian exam, definitely some hard problems there!

[@engineeringmadeasy]

May I ask you which topic from the specification is it related to?

[@zhelyo_physics]

sure this would be under Forces, specifically Newton's 2nd Law.

[@goodtimes5135]

I got it right

[@zhelyo_physics]

Excellent, well done!

[@girindrasinghrathore8418]

I got it correct 😌.

[@PJ-er1nk]

how

[@PJ-er1nk]

what grade are you

[@zhelyo_physics]

Well done! : )

[@girindrasinghrathore8418]

@@PJ-er1nk 12th

[@girindrasinghrathore8418]

@@zhelyo_physics 😊

[@danishmasood4216]

O level

[@danishmasood4216]

I m in O level.

[@zhelyo_physics]

I imagine the physics is similar? Good luck with it!

[@Tushar-kj5wm]

It's a common problem in Indian high schools

[@theanimeboyog9359]

Yeah I am in 10th and I can easily solve it without any coaching neither I want to be an IITian