Answer:
The final speed of the green ball is 8.5 m/s
Explanation:
Mass of croquet balls, m₁ = m₂ = 0.5 kg
Initial velocity of red croquet ball, u₁ = 8.5 m/s
Initially, the green ball is at rest, u₂ = 0
A head on collision takes place between two balls. The red ball stops after hitting the green ball.
Final velocity of red ball, v₁ = 0
Final velocity of green ball is v₂
Using the conservation of linear momentum as :
[tex]m_1u_1+m_2u_2=m_1v_1+m_2v_2[/tex]
[tex]0.5\ kg\times 8.5\ m/s+0=0+0.5v_2[/tex]
v₂ = 8.5 m/s
So, the final speed of the green ball is 8.5 m/s. Hence, the correct option is (b) "8.5 m/s".
