A rocket is fired ‘vertically’ from the surface of mars with a speed of 2 kms^−1. If 20% of its initial energy is lost due to martian atmospheric resistance, how far will the rocket go from the surface of mars before returning to it ? Mass of mars = 6.4×10^23 kg; radius of mars = 3395 km; G = 6.67 x 10^-11 Nm^2/kg^2.

