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units. A train starts in a train station at time t=Os at position x=0m. For 1 minute, the train has a constant acceleration a = 1 m s, then it has zero acceleration for 5 minutes, then it has a constant acceleration a = -0.25 m s for 4 minutes until it stops with zero velocity at the next train station. The train track is a straight line. A) Draw a graph of the velocity of the train versus time. B) Calculate the total displacement of the train over the 10 minutes. Rubric: 1 point identify the correct equation, 1 point mathematical manipulations, 1 point correct answers with units. Astronaut David Scott dropped a hammer and a feather at the same time on the Moon, from a height of 1.20 m and observed them hit the lunar soil at the same time. The surface gravity of the Moon gives a constant acceleration of 1.62 m/s A) How long did it take for the objects to hit the surface of the Moon after their release? B) What was the speed of the objects as they hit the surface of the Moon?

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