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Sahay Sir > Question Answers > JEE Mains Physics 2002-2019 Solved Video Solutions > Chapter 4 - Work, Energy and Power > An alpha-particle of mass m suffers 1-dimentinal elastic collision with a nucleus at rest of unknown mass. It is scattered directly backwards losing 64% of its initial kinetic energy. The mass of the nucleus is :

An alpha-particle of mass m suffers 1-dimentinal elastic collision with a nucleus at rest of unknown mass. It is scattered directly backwards losing 64% of its initial kinetic energy. The mass of the nucleus is :

A body of mass m=10−2kg is moving in a medium and experiences a frictional force F=−KV^2. Its initial speed is υ0=10ms^−2. If after 10s its energy is 1/8mυ^2 0 the value of k will be