If a balll is throne vertically downwards from height of tower 100 meter . In how much time body will strike the ground . g= 10 m/s -2
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Answer:
If we define a velocity upwards as positive in sign, then it follows that velocity downward must be negative in sign. To be clear, velocity upwards means that an object's position is changing, and it was at a lower height just a moment ago (it is rising). At a different time, velocity downward means the object's position is changing, and it was at a higher height just a moment ago (it is lowering). In the natural course of throwing something upwards, first it rises, later it falls. Q: How does a positive quantity go negative? A: It passes through zero. Thus, for a split second between these upward and downward motions, it stops. Zero velocity! And if it is no longer moving up, and not yet begun to move down, then it must have reached its highest position.
Answer:
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