# Science

A simple pendulum of length 1m has a wooden bob of mass 1kg.it is strike by a bullet of mass 10^-20 kg moving with a speed of 2×10^2m/s.The bullet gets embedded into the bob. Obtain the height to which the bob rest before swing back.

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1. momentum is conserved ... find the velocity of the bullet/bob after impact

calculate the kinetic energy of the bullet/bob

the K.E. becomes P.E. ... 1/2 m v^2 = m g h ... h = v^2 / (2 g)

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