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Question1

With one's eye at a height of 1 m above water level on a lake, one can just see over the horizon, a point on the boat that is 3 m above water. The distance to the boat is 9.5 km. use this information to estimate the radius of the earth.

Question2

Assume the breaks on your car generate a constant deceleration. If you can come to a stop from 40 miles per hour in 100 feet, how long did it get to travel the first 50 feet?

Question3

A 400- gram object is dropped from the roof of a building. Suppose air resistance is a constant 0.3 Newtons. The object takes 0.04 sec to pass from the top to bottom of the window is 10 m that is 2 meters high. The bottom of the window is 10 m above ground level. What is the height of building?

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