Find mass given acceleration and upward force

[zonesthesia93]

Homework Statement

Find the mass of the body when:
upward force is 10N
downward force unknown (mg N)
acceleration 5ms^-2 downwards

Homework Equations

F=ma
W=mg

The Attempt at a Solution

Need to work out the resultant force?? Then find the mass from there...


Thank you!

 

[DiracRules]

That's correct.
Remember that $\sum \vec{F}=m\vec{a}$