Answer:
2.45Joules
Explanation:
since kinetic energy is K.E.=1/2m[tex]v^{2}[/tex]
lost in potential energy is gain of kinetic energy
mgh=1/2mv^2
9.8*2*0.5=v^2
[tex]v^{2}[/tex]=9.8
v=[tex]\sqrt{9.8}[/tex] =3.13m/s
now k.e. = 0.5*m*[tex]v^{2}[/tex] =0.5*0.5*9.8 =2.45J
