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a 74.9 kg person sits at rest on an icy pond holding a physics book. he throws the physics book west at 8.25 m/s and he recoils at 0.215 m/s what is the mass of the physics book

Respuesta :

MathPhys

Answer:

1.95 kg

Explanation:

Momentum is conserved.

m₁ u₁ + m₂ u₂ = m₁ v₁ + m₂ v₂

0 = (74.9) (-0.215) + m (8.25)

m = 1.95

Answer:

1.95

Explanation:

Momentum is conserved. Remember that.

Whatever p1 is, p2 will be the opposite

For example:

p1=-34

p2=34

See? They cancel out to 0

Hope it helps a little

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