Suppose the velocity vector V in a velocity field is given by: At the point (x,y,z) = (7,10,3), \mathrm{V}=6 \mathrm{x} \dot{\mathrm{j}} \mathrm{m} \cdot \mathrm{s} ^^20a)^^20|\vec{V}|=18m/s b)|\vec{V}|=42m/s c)|\vec{V}|=60m/s d)|\vec{V}|=210m/s