3. A bullet of mass m is fired into a suspended block of mass 4m with speed u. The bullet then embeds in the block and raises the block. What is the maximum raised height H?

6. A uniform spherical planet has mass M and radius R. A very thin tunnel passes from one end of the planet, through the planet center, and then out from the other end of the planet. A particle of mass m fell into one end of the tunnel and then performed simple harmonic motion. Find the angular frequency of the simple harmonic motion.

3. A bullet of mass m is fired into a suspended block of mass 4m with speed u. The bullet then embeds in the block and raises the block. What is the maximum raised height H?

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