1.

The ballistic pendulum is a block of 3.0 kg mass suspended from a thread 2.5 m long. A bullet with the mass of 9.0 g hits the block and sticks in it, the result being a deflection of the system by an angle of 18^@(Fig). Find the bullet's speed

Answer»


SOLUTION :According to the law of conservation of momentum mv = (M + m) u , according to the law of conservation of energy 1/2 (M +m) `u^2 = (M+m) GH` . Hence
`V=(M+m)/msqrt(2gh)=(M+m)/msqrt(2gl(1-cosalpha))`


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