If an object is thrown vertically upward, its speed gradually diminishes to zero (Fig. 17A). It then starts to accelerate downward again. The height to which it rises depends on the speed at which it is thrown, but the rate of deceleration is the exact opposite of the acceleration, as worked out in Fig. 19. In fact the same scale can be used for both acceleration and deceleration.
FIG 17A The speed of a ball, rising vertically under the influence of gravity, gradually diminishes to zero. The same spacing of drawings ...
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