MCQ
When a stone falls freely towards the earth, its total energy ?
- AFirst decreases and then becomes zero
- BRemains constant
- CIncreases
- DDecreases
Explanation:
Since the ball is in free-fall, the only force acting on it is gravity. Therefore, we can use the principle of conservation of mechanical energy - initially the ball has potential energy and no kinetic energy. As it falls, its total energy (the sum of the KE and the PE) remains constant and equal to its initial PE. when reaches the ground there is no PE only KE I.E., Equal to initial PE
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Air is:
A sprinter is running along the circumference of a big sports stadium with constant speed Which of following do you think is changing in this case?