A particle moves along a path and its speed increases. In which ...

[RRMR]

A particle moves along a path and its speed increases. In which of the following cases are its acceleration and velocity vectors parallel?
  1.when the path is a parabola
  2.when the path is straight
  3.when the path is circular
  4.never

Question 2

Rank the launch angles for the five paths in the figure below with respect to the time of flight, from the shortest time of flight to the longest.
 

[polinasid]

Answer to Question 1

2

Answer to Question 2

3

[RRMR]

Thanks

[polinasid]

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