Object P of mass 4.0kg moves north at 6.0m/s. Object Q of mass 2.0kg moves east at 8.0m/s. Ignoring all external forces, what is the magnitude of the total linear momentum of the two-object system?
a) 4.8×101kg⋅m/s
b) 3.4×101kg⋅m/s
c) 2.9×101kg⋅m/s
d) 4.0×101kg⋅m/s