Verified Answer :

We know, F = m*a
Here, F = 600-400 = 200 N downwards 
m = 60 Kg

Substitute their values, 
a = 200/60
a = 20/6
a = 10/3
a = 3.33 m/s² downwards

In short, Your Answer would be 3.33 m/s² downwards

Hope this helps!

The answer is 3.3 m/s^2 (m/s squared)

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