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Question 61: Three speed-time graphs are given below : Which graph represents the case of: (i) a cricket ball thrown vertically upwards and returning to the hands of the thrower ? (ii) a trolley decelerating to a constant speed and then accelerating uniformly ? Lakhmir Singh Physics Class 9

Answer»

1. Graph c2. Graph aExplanation:(i) Graph (c): The speedof the ball GOES on decreasing uniformly as it moves upward ZERO at the highest point, and then increases uniformly as it moves DOWNWARD.(ii) Grap(a): The SPEED of the trolley decreases uniformly, then it moves at a CONSTANT speed, and then the speed increases uniformly.



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