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Describe an activity to explain the situ...

Describe an activity to explain the situation that "the speed changes but the direction of motion remains constant".

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1) Set up an inclined plane as shown in the figure.
2) Take a ball and release it from the top of the inclined plane.
3) The positions of the ball at various times are shown in the figure given below.

4) On close observation we find that when the ball moves down on the inclined plane, its speed increases gradually, and the direction of motion remains constant on inclined plane.
5) Now push the ball till it acquires certain speed and release it with that speed from the bottom of the inclined plane.
6) We observe that the ball moves up- ward to a certain distance and comes back to the bottom.
7) From this we conclude that the speed changes but the direction of motion remains constant.
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