A girl walks 3 m due east and then 4 m due north 1. The girl's displacement from the starting point is? a) 1 m B) 3 m c) 5m d) 7m 2. What was the total distance travelled by the girl? a) 1m b) 3m c) 5 m d) 7m 3. A single force, which can replace and have the same effect as two or more forces acting together, is known as the a) resultant b) equilibrant c) moment d)vector 4. Which of the following is not a vector quantity? a) displacement b) acceleration c) density d) momentum

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!