How can I create impact load on a beam?

I have modelled a beam using the toolbox Calfem, and are trying to apply a dynamic impact load from a dropped object. I am able to apply a load in Newtons, but I want to apply the load using Velocity/kinetic energy from the dropped object. Is this possible? My dynamic loading code is as follows:

%Defenition of the time step of integration dt=0.005;

%Defenition of the time end of integration T=0.35;

%Specification of the dynamic load G=[0 0;0.15 1;0.25 0;T 0];

%Interpolation function g=g(t) for the dynamic load [t,g]=gfunc(G,dt);

%Specification of the load vector f f=zeros(9,length(g)); f(5,:)=-5613150*g;

%Specification of boundary conditions and initial conditions bc=[1 0;2 0;8 0]; d0=zeros(9,1); v0=zeros(9,1);

%Spesification of programs output parameters ntimes=[0.1:0.1:1]; nhist=[5];

%Specification of time integration parameters ip=[dt T 0.25 0.5 10 1 ntimes nhist];

%Time integration k=sparse(K); m=sparse(M); [Dsnap,D,V,A]=step2(k,[],m,d0,v0,ip,f,bc);