Question

A bullet of mass 10 g moving horizontally with a
velocity of 400 ms-1 strikes a wood block of mass
2 kg which is suspended by light inextensible
string of length 5 m. As a result, the centre of
gravity of the block found to rise a vertical distance
of 10 cm. The speed of the bullet after it emerges
out horizontally from the block will be
[NEET (Phase-2) 2016]
(1) 100 ms
(2) 80 ms -1
(3) 120 ms-1 (4) 160 ms-1​

Answer 1

Answer:

change in kinetic energy equal to the potential energy and by law of conservation of momentum