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A ball is thrown vertically upwards with a velocity ‘u’. The velocity with which it falls to the earth again is:
- a)Greater than ‘u’
- b)Greater than or equal to ‘u’
- c)Equal to ‘u’
- d)Less than ‘u’
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
A ball is thrown vertically upwards with a velocity ‘u’. T...
For vertically upward motion: g is negative as it opposes the motion.
v = u – gt
0 = u – gt
t = u/g (1)
For vertically downward motion: g is positive as it is in the direction of motion.
v = u + gt
v = 0 + gt
t = v/g (2)
From equation 1 and 2
v = u
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A ball is thrown vertically upwards with a velocity ‘u’. T...
Pre requisite knowledge - equations of motion or work energy theorem or kinetic energy .its impossible for the speed to be greater than u .speed will be equal to u if there is no air resistance ( friction) . but if there is friction ( which is there in real life ) then the speed will be less than u . but in these type of answer , if not given , we need to ignore/ neglect the friction and the answer will be C . hope it helped
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