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Nick Borowicz. Created for Albert.io, copyright 2017. All rights reserved.

A block of mass $m$ is released from rest at a height of $h$ on a frictionless track, as shown above. The block collides and sticks to another block of mass $m$ that is at rest at the bottom of the hill.

What is the height reached by the blocks after the collision?

A

$h$

B

$\cfrac{h}{3}$

C

$\cfrac{h}{2}$

D

$\cfrac{h}{4}$

E

$2h$

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