Question

Alguém sabe resolver isto ?

Answer 1

Vamos lá.

a)

xa=2s→ xa²=4m

xb=6s→xb²=36m

Vm= (36-4)/(6-2)=32/4= 8m/s

b)

xa=2s→xa²=4m

xb=8s→xb²=64m

Vm=(64-4)/(8-2)

Vm=60/6=10m/s

c) Vm=(xb²-xa²) /(xb-xa)

Vm=(xb-xa)(xb+xa)/(xb-xa)

Vm=xb+xa ∎