Pls answer Q3 Q4 fast plzzzz

Dear Student,
3.
m = 80 kg
we know that, 
acceleration = change in velocity/change in time
a = 30 - 20/15 - 10
a = 10/5
a = 2 m/s2
We know that, 
Force = mass × acceleration 
F = 80 × 2
F = 160 N

Kindly post the different question in different thread.

Regards

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