Very easy mechanics question

It is part (iii) which has stumped me but I thought I would give you the prologue aswell.

A load of mass 150kg is accelerating vertically upwards as the result of the pull of a crane wire. tension in the wire is 1488N
(i) Assuming only forces are weight and tension calculate acceleration.
(ii) measurements actually show a = 0.05ms-2 because of resistance to motion of the load, calculate the resistance.

(iii) In a new situation the load is accelerating downwards at 4ms-2 and resistances to the motion or negligible
Show that the tension in the crane wire is 870N

All of this is based round simple F=ma stuff, netwon's second law as it were, but this really has me stumped :frown:

and made me feel quite stupid.

any help would be appreciated.

Reply 1

TheTallOne

A_Fictitious

(iii) In a new situation the load is accelerating downwards at 4ms-2 and resistances to the motion or negligible
Show that the tension in the crane wire is 870N

All of this is based round simple F=ma stuff, netwon's second law as it were, but this really has me stumped :frown:

and made me feel quite stupid.

any help would be appreciated.

What forces are acting on the object?