1.

in order to gain velocity of 12 m/s , how long should a force of 30 N be exerted on a body of mass 5 kg ?

Answer»

Force = mass * ACCELERATION   by Newton's law.

acceleration a = 30 N / 5 kg = 6 m/s²

  FINAL velocity = v,      initial velocity = U,        time duration = t
     we know from equations of dynamics/kinematics:  
              v = u + a t
         t = (v - u) / a = 12 / 6 = 2  seconds.



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