Question

Croquet balls must have a mass of 0.50 kg. A red croquet ball is moving at 5 m/s. It strikes an at-rest green croquet ball head-on and then continues to move in the same direction, but with a speed of 2 m/s. What is the final speed of the green ball?
A.
5 m/s

B.
0.5 m/s

C.
2 m/s

D.
3 m/s

Answer 1

Answer:

Explanation:

The Law of Momentum Conservation for us has the equation

$[m_rv_r+m_gv_g]_b=[m_rv_r+m_gv_g]_a$ and filling in:

$[(.50)(5.0)+(.50)(0)]=[(.50)(2.0)+(.50)v_g]$ and

2.5 = 1.0 + .50v and

1.5 = .50v so

v = 3 m/s