College Physics (7th Edition)

a). $-8.25m/s^{2}$ b). $0.841$ c). $31m/s$
a). $a=\frac{v^{2}-u^{2}}{2S}=\frac{-29.15^{2}}{2\times51.5}=-8.25m/s^{2}$ b). Coefficient of friction $=-\frac{a}{g}=0.841$ c). initial velocity = $\sqrt (v^{2}-2aS)=\sqrt (0^{2}-2\times(-8.25)\times57.3)=31m/s$