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2.6 velocity.....................

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what quantity?
How did you find the answer?
Can you please explain it?
i base in the time that you have given 2 seconds, and in the netforce added 55 with the power of weight that you give 120 kg. the greater the force the greater the acceleration,just use your mind you have the ability to solve that just believe in your self never give up.
Use F=ma to get acceleration:

a=0.45833 m/s^2

Now get the final velocity (Vf):

Note Acceleration is change in velocity over change in time.

  we have: a = (Vf - Vo)/(t2 -t1)
                      Vf = final velocity               Vo = initial velocity
                      t2 = final time                   t1 = initial time

    solving for final velocity Vf:

(Vf- Vo) = a(t2 -t1)
Vf = a(t2 -t1) + Vo
    = 0.45833(2 - 0) + 1.5
Vf  = 2.41666 m/s  ........Answer..
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