Question

Va rog ajutați mă e urgent

Answer 1

a)

r₁=20+4t₁²=20+4*2²=20+16=36 (cm)

r₂=20+4t₂²=20+4*5²=20+100=120 (cm)

Δr=r₂-r₁=120-36=84 (cm)

b)

x=x₀+v₀t+at²/2 (cm)

x=20+4t² (cm)

x₀= 20 (cm)

v₀=0

a/2=4=>a=8 cm/s²

v=v₀+at₂=0+8*5=40 cm/s

vm=(v₀+v)/2=(0+40)/2=40/2=20 cm/s