Verified Answer :

Formula from Newton's 2nd Law: 
Force = massacceleration
3200 = 160
acceleration
3200 / 160 = acceleration = 20\(m/s^2\)

To find the acceleration of the mass you'll need to use this formula;

a = \(\frac{F}{m}\)

Now lets substitute and solve;

a = 3200 -N ÷ 160-kg
a = 20m/s²
hope that helps Have a nice day:D