An asteroid of mass m is approaching earth, initially at a distance of 10 Re with speed vi It hits the earth with a speed vf (Re and Me are radius and mass of earth), then

Question:

An asteroid of mass m is approaching earth, initially at a distance of 10 R_e with speed v_i It hits the earth with a speed v_f (R_e and M_e are radius and mass of earth), then

Options :

(a) vf^2=vi^2+2Gm/MeR (1-1/10)
(b) vf^2=vi^2+2GMe/Re (1+1/10)
(c) vf^2=vi^2+2GMe/Re (1-1/10)
(d) vf^2=vi^2+2Gm/Re (1-1/10)

Answer :

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An asteroid of mass m is approaching earth, initially at a distance of 10 Re with speed vi It hits the earth with a speed vf (Re and Me are radius and mass of earth), then

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