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|dw:1326468874952:dw|

First write down the equation of motion. What do you get?

i'm thinkin 2pi/sqrt((k1+k2)/m)

see there is SHM used

i.e.,
\[ T = 2\pi \sqrt{ \frac{m}{k_1+k_2} } \]

Left picture, two springs in parallel
Right picture, two springs in series
The terms "In parallel" and "in series" come from electronics and circuits, where we talk about resisters being in parallel or in series. If you don't know circuits, then forget about that part of it altogether, and just focus on the springs in the picture.

hahaha true said

all-learned person like james*