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m = 80kg
v = 20cm/s = 0,2m/s
Szukane:
p = ?
Wzór:
p = mv
p = 80kg × 0,2m/s
p = 16 kgm/s
Odp.: Pęd ciała wynosi 16 kgm/s .
2. Dane:
m₁ = 0,2g = 0,0002kg
v₁ = 36km/h = 10m/s
m₂ = 1kg
v₂ = 1m/min = 1/60 m/s
Szukane:
p₁ = ?
p₂ = ?
Wzór:
p = mv
p₁ = 0,0002kg × 10m/s
p₁ = 0,002 kgm/s
p₂ = 1kg × 1/60 m/s
p₂ = 1/60 kgm/s
p₁ < p₂
p₂ - p₁ = 1/60 - 0,002 kgm/s ≈ 14,7 kgm/s
Odp.: Żółw ma pęd o 14,7 kgm/s większy od muchy.