**Question1**

If you drop a rock from a height of 7.1 m, it accelerates at g and strikes ground 1.20374 s later.

If you drop the similar rock from half that height, what will be its acceleration? The acceleration of gravity is 9.8 m/s^2.

**Question2**

A 400g lemming waddles horizontally off a small 4.9m high cliff with a horizontal velocity of 0.5m/s.

a. How far from base of the cliff will the lemming land?

b. What will be lemming's speed just before landing?

c. What is lemming's kinetic energy just before landing?

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