A particle moves with a velocity v→ = 6î

A particle moves with a velocity v^{^→} = 6î - 4ĵ - 3k̂ m/s under the influence of a constant force F^{^→} = 20î - 15ĵ - 5k̂ N. The instantaneous power applied to the particle is

P = F^{^→} . v^{^→} = (20î - 15ĵ - 5k̂) . (6î - 4ĵ - 3k̂)
= 6 × 20 – 4 × 15 – 3 × 5 = 45 J/s