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Question

A force of 8.19 N acts on a(n) 5.1 kg object for 18.9 s. What is the object’s change in momentum? Answer in units of N·s' 

What is its change in velocity? Answer in units of m/s

Answer 1

 Force  of the object = 8.19 N

 Duration of Time  =18.9 s

 Mass of the object  = 5.1 kg

The relation between  force,momentum and time is  

                                                                Force =Change in Momentum / time

                                                               => Change in  Momentum = force * time      

                                                               =  8.19 * 18.9

                                                               =   154.79 N -s.

So, the change in momentum is 154.79 N -s.

Now calculate for the change in its velocity :

The relation between force, velocity ,mass and time is  

                                                                Force = (mass * Change in velocity)/ time

                                                                  => Change in velocity = (force * time) / mass

                                                                  = (8.19 * 18.9) / (5.1)      

                                                                   = 30.35 m/s.

So, the change in Velocity is 30.35 m/s.