When we throw a ball upwards and it comes back then what is the displacement
Answers
Answer:
The ball is thrown upward.
A ball cannot go up by itself, unless some how, it gains energy.
The boy did some work and gave the ball some energy. This is observed by some change in the ball. Initially the ball had no speed. But on leaving the hands of the boy, the ball has gained some momentum or speed.
Thus the boy’s work , has been transfered to the ball. The boy’s work is over and he may or may not leave the scene. We need not bother about him hereafter.
With the energy gained by the ball , it does work against gravity and goes up till it looses all its kinetic energy which it gained from the boy. Here we must be careful in our observations. Though it looses energy, it looses only its kinetic energy due to it's speed.But at the same time its potential energy increases . ( This energy is due its position. Objects at a height have more energy than one at the ground)
Again it falls down. This implies it gains speed . The height decreases. The ball looses its potential energy and kinetic energy increases.
When it reaches the ground , it gains its original kinetic energy given to it by the boy.
In fact through out its journey, it has not lost any energy, since at any instant the total energy remained the same.
The work done by the boy ( he applies some high force and moves his hand throuh some small distance) ( work is force * displacement) can also be calculated by the kinetic energy of the ball.
Instead of going up, if the ball is moving horizontally over a horizontal plat form and in the absence of friction, it will be moving with a velocity for ever.
Answer:
Now the ball is under the influence of gravity, which, on the surface of the Earth, causes all free-falling objects to undergo a vertical acceleration of –9.8 m/s2.
Explanation:
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