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## Homework Statement

[PLAIN]http://img651.imageshack.us/img651/8828/capage1.jpg [Broken]

## Homework Equations

F = ma

Sum of moments about a point = 0

## The Attempt at a Solution

My attempt can be seen above. The only part which I seem to have a problem with is part f. In order for there to be a deceleration there must be a nett force acting upwards.

Therefore I figure that part a force would remain the same as the mass hasn't changed.

part b force would also remain the same

and part c force would increase so as to produce the decelleration? f=ma so the nett force would need to be f = 600N, therefore it would increase by 600N?

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