[tex]1.E_{p} =mgh= 50 \ 10 \ 50 = 25000 J\\2.\\ m=50 ton= 50000kg= 5 \ 10^4kg\\v=720\frac{km}{h} = 200\frac{m}{s} = 2 \ 10^{2} \frac{m}{s}\\h= 300m = 3 \ 10^{2}m\\g=10\frac{m}{s^{2}} \\E_{c}=E_{p}+E{k}= mgh+ \frac{mv^{2}}{2} =5 \ 10^4 \ 10 \ 3 \ 10^{2}m +\frac{5 \ 10^4 \ 4 \ 10^{4} }{2} =15 \ 10^{7} + 10 \ 10^{8}= 1,5 \ 10^{8} + 10 \ 10^{8}= 11,5 \ 10^{8} J[/tex]
