using conservation of energy
1/2 m 02 + m g h = 1/2 m v2 + m g x 0
v2 = 2 g h
h = L cos
h = ( L2 - B2 )1/2
KE = 1/2 m v2
= 1/2 m 2 g (L2 - B2)1/2
= m g (L2 - B2)1/2
so KE = m g L cos
or
KE = m g (L2 - B2)1/2
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