C) For a rocket launched from Earth's surface to be able to escape Earth's gravity it must reach speeds of 11.20 km/s. What is this speed in mi/s and in mi/hr?Answer: 6.961mi/sAnswer: 2.506*10^4mi/hrD) Distance from Earth to Moon is about 2.39×105 miles. Assuming that a spacecraft can take off from Earth, attain escape velocity (see part (C)) and directly get to the Moon and land, what would bethe time taken for travel to the Moon? Apollo 11 astronauts reachedMoon in 4 days, 6 hours and 45 minutes in July 1969. It is not reallypractical to go to Moon in one shot. One way is to get a craft to Earth orbit, then launch a smaller craft toward Moon and let it get to lunar orbit, and then have a module land in a suitable spot on theMoon such that it has the power to take off and dock back to the mother craft and then return to Earth orbit and to Earth. This is why it takes a long time to get there. We will return to this problemwhen we get to study Gravitation and Circular
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