Answer
Magnitude of the change in linear momentum $=4.9$ $kg.m/s$
Work Step by Step
Change in linear momentum $= Final$ $momentum - Initial$ $momentum$
Therefore,
Change in linear momentum $= mv_{f} - mv_{i}$
Substituting the known values and setting $v_{i}=(-5)m/s$ (as it is in opposite direction of $v_{f}$) in the expression and solving gives:
Change in linear momentum $= 0.7kg\times(2) m/s - 0.7kg\times (-5)m/s$
Change in linear momentum $= [1.4-(-3.5)]$ $kg.m/s$
Change in linear momentum $= 4.9$ $kg.m/s$
