A $1\mathrm{.}5$ kg mass on a spring oscillates horizontally on a frictionless table in simple harmonic motion, as shown in the graph below.

a$)$ What is the amplitude of the oscillations?

$+-2$ based on the grouph

$+-2cm$

At$-0\mathrm{.}02$m

b$)$ What is the spring constant?

Wi $\frac{\text{d}\text{e}\text{l}}{T}\frac{\text{d}\text{e}\text{l}}{},0\mathrm{.}8ra\frac{d}{sec}$

$w_2^2\frac{\sqrt[\phantom{2}]{k}}{(m{)}^2},k_2(1\mathrm{.}5)(0\mathrm{.}8{)}^2$

$m_1^2=\frac{k}{m},k_2*m\mathrm{.}96\frac{w}{m}$

$k=m{w}^2,$

$T18s$

c$)$ How much total energy does the mass$-$spring system have at $t=2\mathrm{.}0$ s$?$