bonjour vous pouvez maider svp sur les equation mrc infiniment

Réponse:

1

a. v = 1000/40

v = 25 m/s

b.

d = v × ∆t

d = 12×300

d = 3600 m

c.

∆t = d/v

∆t = 12400/6

∆t ≈ 2066,7 s

2.

a.

d = ½×3×10²

d = 150 m

b.

a = 2d/∆t²

a = 2×1000/16²

a = 7,825 m/s²

c.

∆t =√(2d/a)

∆t = √(2×4000/4)

∆t = 44,7 s

3.

a. Ec = ½×800×9²

Ec = 32400 J

b.

m = 2Ec/v²

m = 2×13000/8²

m = 406,25 kg

c.

v = √(2Ec/m)

v = √(2×17500/80)

v ≈ 20,9 m/s