Question

Write about the contribution of Raja rammohan Roy to and the practice of sati

Answer 1

Coz the efforts made by him banned the practice of sati
He also established second marriage.

Answer 2

Raja Rammohun Roy raised his voice against the most barbaric social evil of the time, sati. He launched a campaign against it. His persistent efforts yielded results and sati was declared illegal in 1829. 
Sati is the practice of widow burning.