1.-Sean los siguientes vectores A=3i + 2j - 7 k B=3J + 6 K + 5 i Hallar a) |A| b) A+B c) |A+B| d) A-B e) 2A+3B

The drag force, fd, imposed by the surrounding air on a vehicle moving with velocity v is given by fd = cdaρv 2/2 where cd is a constant called the drag coefficient, a is the projected frontal area of the vehicle, and ρ is the air density. an automobile is moving at v = 80 kilometers per hour with cd = 0.28, a = 2.3 m2, and ρ = 1.2 kg/m3.