I attached the full question and the diagram it refers to. I can do (a) and (b) but I have no idea what (c) is asking? please could someone explain to me how I would go about doing that? Thanks! And if you could be extra helpful it would be great if you could go through (d) too? But i don't mind about (d) as much...
also:
The answer to (b) is 44.4m/s , which you get by substituting into the equation Ft=mv-mu
If you can't read the question please let me know and I'll type it out