Problem 7.4

จาก \(Δ\vec{v} = \vec{v} - \vec{u}\)

îĵîĵ

\(\Delta \vec{v} = (8.00 + 2.00 m/s) - (5.00 + 5.00 m/s)\)

îĵ

\(\Delta \vec{v} = 3.00 - 3.00 m/s\)

îĵ

จาก \(\vec{a}_{av}=\frac{\Delta \vec{v}}{\Delta t}=\frac{3.00î  - 3.00ĵ  m/s}{3.00 s}= 1.00 - 1.00 m/s^{2}\)

\(\therefore |\vec{a}_{av}|=\sqrt{(1.00)^{2} + (-1.00)^{2}}= 1.41 m/s^{2} \;\blacksquare\)

และ \(θ_{x}= \tan -1(\frac{-1.00 m/s}{1.00 m/s}) = -45.0º \;\blacksquare\)