4.21. A boy traveling in an open car moving on a labeled road with constant speed tosses a ball vertically up in the air and catches it back. Sketch the motion of the ball as observed by a boy standing on the footpath. Give an explanation to support your diagram.


Hint: The horizontal speed of the ball is the same as that of the car.
Step 1: Sketch the motion of the ball with explanation

The path of the ball observed by a boy standing on the footpath is parabolic. The horizontal speed of the ball is the same as that of the car, therefore, the ball as well car travel is equal to horizontal distance. Due to its vertical speed, the ball follows a parabolic path.

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