1) A motorist travels to work with a constant speed of 52.0 km/h except for the 12min spent
waiting for a very long train to pass. If the person's average speed is 31.2 km/h, how much time
did it take this person to get to work and how long is his or her commute (time to get to work
without stopping for trains)?
2) Alice leaves home in Chicago at 9:00 AM and travels east at a steady 60mph. Susan, 400 miles
to the east in Pittsburgh, leaves at the same time and travels west at a constant 40mph. Where
will they meet for lunch?
3) We need to make it to a Lakers game. The total trip is 100 miles. It’s 6pm now. The game
starts at 8:00. We know that we will only be able to go 30mi/h on the 405, for a stretch of 39
miles. For the rest of the trip there will be no traffic, so we can move as fast as we want. BUT,
parking takes 15 minutes. How fast do we need to move to get there on time? Are we above the
speed limit (75mi/h)?
4)Assuming constant acceleration, a DeLorean DMC12 can go from zero to 60 mph in 8.5s.
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 Fall '10
 ManojKaplinghat
 Physics, Acceleration, Work, Lakers, cons tant acceleration, Pit t sburgh, wes t, 8.5s

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