Physics (10th Edition)

a) 2.47 m/$s^{2}$ b) 2.24 m/$s^{2}$
a) $v^{2}$ = $u^{2}$ + 2ax a = $\frac{v^{2} - u^{2}}{2x}$ = $\frac{7.70^{2} - 0^{2}}{(2)(12)}$ = 2.47 m/$s^{2}$ b) horizontal component of acceleration = 2.47cos(25$^{\circ}$) = 2.24 m/$s^{2}$