Ared croquet ball, moving at 8.5 m/s, strikes an at-rest green ball head on. if the red ball stops after hitting the green ball, what is the final speed of the green ball? croquet balls must have a set mass of 0.50 kg a. 17.5 m/s b. 8.5 m/s c. 4.25 m/s d. 5 m/s

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 :

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".

answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg