Question

An 8 kg mass moving at 8 m/s collides with a 6 kg mass

moving in the same direction at 6 m/s. After the collision,
both the 8 and the 6 kg mass continue to move in the same
direction. If the 8 kg mass is moving at 5 m/s, what is the
speed of the 6 kg mass? *

Answer 1

10 m/s

Step-by-step explanation:

Momentum before collision = momentum after collision

m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂

(8 kg)(8 m/s) + (6 kg)(6 m/s) = (8 kg)(5 m/s) + (6 kg) v

64 kg m/s + 36 kg m/s = 40 kg m/s + (6 kg) v

60 kg m/s = (6 kg) v

v = 10 m/s