d
ઉડયનનો સમય  \({\text{T}}\,\, = \,\,\sqrt {\frac{{{\text{2h}}}}{{\text{g}}}} \,\, = \,\,1\,s\)

બોલ ની અવધિ \( = \,\,{v_{belt}}\,\, \times \,\,T\,\, \Rightarrow \,\,20\,\, = \,\,{v_{belt}}\,\, \times \,\,1\,\, \Rightarrow \,\,{v_{belt}}\,\, = \,\,20\,\,m/s\)

\({v_{belt}}\,\, = \,\,20\,\, \times \,\,5\,\, = \,\,100\,\,m/s\)

હવે રેખીય વેગમાનના સરક્ષણનું લગાડતા,  \( \,\,\left( {0.01} \right)\,V\,\, = \,\,\left( {0.2} \right){v_{belt}}\,\, + \,\,\left( {0.01} \right)\,{v_{bullet}}\,\, \Rightarrow \,\,V\,\, = \,\,500\,\,m/s\)