Essai & \multicolumn{3}{c}{Test} \\ \hline
Grandeurs brutes /& & & &dérivées\\ \hline
x	&I(x)	&t	&I(t)	&a\\ \hline
cm	&cm	&s	&s	&cm/s$^2$\\ \hline\hline
10	&0.5	&0.143	&0.002	&9.81\\ \hline
20	&1.0	&0.202	&0.002	&9.81\\ \hline
30	&1.5	&0.247	&0.002	&9.81\\ \hline
40	&2.0	&0.286	&0.002	&9.81\\ \hline
50	&2.5	&0.319	&0.002	&9.81\\ \hline
60	&3.0	&0.350	&0.002	&9.81\\ \hline
70	&3.5	&0.378	&0.002	&9.81\\ \hline
80	&4.0	&0.404	&0.002	&9.81\\ \hline
90	&4.5	&0.428	&0.002	&9.81\\
\hline