What is the speed of the second ball after the collision?

AI Thread Summary
In an elastic collision involving two equal mass billiard balls, the first ball traveling at 4.0 m/s comes to a complete stop after the collision. The second ball, initially at rest, will then move with the same speed as the first ball before the collision, which is 4.0 m/s. The relevant equation to use for this scenario is the conservation of momentum, specifically p_initial = p_final. This principle states that the total momentum before the collision equals the total momentum after the collision. Understanding this concept is crucial for calculating the speed of the second ball independently.
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A billiard ball traveling at 4.0 m/s has an elastic head-on collision with a billiard ball of equal mass that is initially at rest. The first ball is at rest after the collision. What is the speed of the second ball after the collision?

What equation should i use? Please post.
 
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Thanks...but

That shows me the anser, I'm looking for the equation to find the answer myself. Thank you anyways.
 
Look again.
 
TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
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