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a)find speed Block A before it hits block B

b)find speed of combined blocks after collision

c)find the amount of kinetic energy lost

a)1/2mv^2=mgh

v=Squaroot 2gL

b)M(Squaroot 2gL) + M ( 0 )= (2M)V

v= (Squaroot 2gL)/2

c) i know the equation for this one but i dont know how to find the KE lost

1/2(2M)[(Squaroot 2gL)/2]=Uk*mgL

(mgR)/2=Uk*mgL