What is the acceleration of train travelling at `40ms^-1` as it goes round a curve of `160m` radius?

A rope of negligible mass is wound round a hollow cylinder of mass 3kg and radius 40cm . What is the angular acceleration of the cylinder if the rope is pulled with a force of 30N ? What is the linear acceleration of the rope ? Assume that there is no slipping.

What is the value of sin^-1(sin160^@) ?

Two cars A and B travel from the same point and in the same direction. A is travelling at a speed of 30 k(m) / hour and B at a speed of 40 (km) / hour . After 4 hours, what is the distance between the cars? How far the cars would be if they travelled in opposite direction?