Question

Average Vector Speed, Truck You stopped 8.4km while driving, moving 8.4km at a speed of 70km / h and stopped short of fuel. You left the vehicle and walked 30 minutes to the gas station 2.0 km away.
1
(a) Find the total transition from moving the truck to the gas station? (b) Find the interval Dr for the first time you move the truck to the gas station?

Answer 1

a)

$$s=8.4+2=10.4\ km$$

b)

$$T=\frac{8.4}{70}+0.5=0.62\ h=37.2\ min$$

Average speed is

$$v=\frac{10.4}{0.62}=16.8\frac{km}{h}$$