Q$5)$ An object moving with constant acceleration along the x $-$axis goes from $x=10m$ to $x=50m$ in $2\mathrm{.}0$ sec $.$ The velocity at the end of this time interval is $10\frac{m}{s}.$ The acceleration $($in $\frac{m}{s^2})$ of this object is:

a$)10$

b$)-2\mathrm{.}2$

c$)2\mathrm{.}2$

d$)-10$

e$)-5$