Question

A branch falls from a tree. how fast is the branch moving after 0.28 seconds

Answer 1

2.74m/s

Since the branch is falling under gravity we can use one of the equations of motion:

v=u+at

This becomes:

v=0+gt

∴v=9.8×0.28=2.74m/s

This assumes no air resistance.

Answer 2

The answer should be 2.75 m/s. Hope this helps.