Are the measuring units of Force x time (Fxt) the same as the measuring units of momentum change (mvf - mvi)? Demonstrate it.

Yes

Explanation:

The measuring units of force x time is the same as that of momentum change.

The product force x time is impulse and momentum change is mass x velocity.

The unit of force  = N or kgm/s²  

                  Time  = s

                   Velocity  = m/s

Force x time:

        Unit  = kgm/s² x s  = kgm/s

Mass x (mvf  - mvi ) =  kg xm/s = kgm/s

So, we see that the units are the same

electrical potential energy =0.072 j

explanation:

electrical potential energy is given by

u= q δv

q= charge=6 c

δv= potential difference and is given by

δv= e d

e= electric field

d= distance=5 mm=0.005 m

δv=2.4 (0.005)=0.012 v

now electric potential energy= u= q δv

u=6 (0.012)

u=0.072 j