(Q018) The Earth is round because a. the gravitational tug of the Moon has worn down the jagged edges. b. the solar wind has shaped it. c. erosion over time has worn down the jagged edges of its planetesimals. d. its interior rock is warm enough to flow slowly in response to gravity.

Two manned satellites approaching one another at a relative speed of 0.550 m/s intend to dock. the first has a mass of 2.50 ✕ 103 kg, and the second a mass of 7.50 ✕ 103 kg. assume that the positive direction is directed from the second satellite towards the first satellite. (a) calculate the final velocity after docking, in the frame of reference in which the first satellite was originally at rest.(b) what is the loss of kinetic energy in this inelastic collision? (c) repeat both parts, in the frame of reference in which the second satellite was originally at rest. final velocity(d) loss of kinetic energy = ?