Martin and Paul are skateboarding in a large semicircular halfpipe. Martin start

Question

Martin and Paul are skateboarding in a large semicircular halfpipe. Martin starts out from rest at a height h and collides with Paul standing at the bottom. Martin and Paul have about the same mass. After the collision, which height will Paul reach? Let's neglect friction

The collision is totally inelastic.

h/25

h/16

h/8

h/4

h/2

h

None of the above.

Later that day, Martin does the same thing with Josh, who is 2 times heavier than Martin. If the collision is totally inelastic, what height does Josh reach?
h/25
h/16
h/8
h/4
h/2
h
None of the above.

Explanation / Answer

a) h/4
Why? Paul hits Josh with velocity V; post-collision they have velocity V/2.
H = v

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