Solving Two Falling Spheres Homework Statement

[huybinhs]

Homework Statement

Two spheres of mass M1 and M2 are arranged one above the other as shown. They are separated by a fraction of a mm. They are released from rest and allowed to fall to the ground, a distance h = 6.5 m below. Mass M2 collides elastically with the ground and then elastically with mass M1. Calculate the maximum height the center of M1 rises above the ground after the collision. D = 20 cm, d = 5 cm, M1 = 0.13 kg, M2 = 2.00 kg.

Homework Equations

P = mv

The Attempt at a Solution

I have no ideas how to start on this problem. Any guide?

 

[huybinhs]

I know one more thing is:

Pf = I + Pi

should I calculate the v first? Any ideas?

 

[Redbelly98]

As a start, try answering these two questions:

1. What is the velocity of M2, just before it hits the ground?

2. Using the answer to #1, what is the velocity of M2 just after it collides elastically with the ground?

Note: my questions ask for velocity, not speed. You need to pay attention to direction and whether the velocity is positive or negative.

 

[huybinhs]

Got it! Thanks for your help ;)