question_answer

A 2kg particle is dropped from height\[20\,\,m\]. Just before hitting the ground its velocity is \[19\,m{{s}^{-1}}\] . Find work done by resistance on the particle during its flight \[(g=10\,m{{s}^{-2}})\]

A)  \[39\,J\]

B)  \[-39\,J\]

C)  zero

D)  data insufficient