An asteroid of mass m is approaching earth, initially at distance of 10R_(e ) with speed v_i. It hits the earth with speed vf (Re and M_e are radius and mass of the earth then

An asteroid of mass m is approaching earth, initially at distance of 1

1.	An asteroid of mass m is approaching earth, initially at distance of 10R_(e ) with speed v_i. It hits the earth with speed vf (Re and M_e are radius and mass of the earth then
Answer» `v_(F)^(2)= v_(i)^(2) +(2Gm)/(M_(E )R) (1-(1)/(10))` `v_(f)^(2)= v_(i)^(2) +(2GM_(e ))/(R_( e)) (1+(1)/(10))` `v_(f)^(2)= v_(i)^(2) +(2GM_e)/(R_e) (1-(1)/(10))` `v_(f)^(2)= v_(i)^(2) +(2G)/(R_e) (1-(1)/(10))` ANSWER :C