B. Jerome plays middle linebacker for South's varsity football team. In a game against

cross-town rival North, he delivered a hit to North's 82-kg running back, changing his

eastward velocity of 5.6 m/s into a westward velocity of 2.5 m/s. Determine the

impulse delivered to the running back.

a. 210 kgm/s

b. 250 kgm/s

C. 460 kgm/s

d. 670 kgm/s

Option D

670 Kg. m/s

Explanation:

Initial momentum is given by mv=82*5.6=459.2 Kg. m/s (taking eastward as positive)

Final momentum is also mv but v being westward direction, we take it negative

Final momentum=82*-2.5 = - 205 Kg. m/s

Change in momentum=Final momentum-Initial momentum=-205-459.2=-664.2 Kg. m/s

Impulse=change in momentum=664.2 Kg. m/s rounded off as 670 Kg. m/s