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AS Level Maths forces and motion help please? watch

1. Hey,

Any help on how to do the following question would be really appreciated:

A block of wood A of mass 0.5kg rests on a rough horizontal table and is attached to one end of a light inextensible string. The string passes over a small smooth pulley fixed at the edge of the table. The other end of the string is attached to a ball B of mass 0.8kg which hangs freely below the pulley. The resistance to motion of A from the rough table has a constant magnitude F newtons. The system is released from rest with the string taut. After release, B descends a distance of 4m in 0.5s. The acceleration of B is 3.2m/s^2, and the tension in the string is 5.3 newtons. Modelling A and B as particles, calculate the value of F.

I know that the answer is 3.7, but I can't get there!
Thank you
2. what do you know about the tension in the string? after figuring this out, use F=ma.
3. (Original post by _rhapsodic)
what do you know about the tension in the string? after figuring this out, use F=ma.
Oh okay, thank you

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