A large block of wood of mass M=5.99 kg is hanging from two long massless cords. A bullet of mass m = 10 g is fired into the block and gets embedded in it. The (block+bullet) then swing upwards, their center of mass rising a vertical distance h=9.8 cm before the (block+bullet) pendulum comes momentarily to rest at the end of its arc . The speed of the bullet just before collision is:(take g=9.8 ms-2)