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Problem ~a ballon is accending upwards with a velocity u m/s .after some time a stone is dropped .it takes t seconds to reach the ground ..find the distance travelled by stone.......sir my question is why do we take “u” negative ?

Problem ~a ballon is accending upwards with a velocity u m/s .after some time a stone is dropped .it takes t seconds to reach the ground ..find the distance travelled by stone.......sir my question is why do we take “u” negative ?

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1 Answers

Abhinav
askIITians Faculty 387 Points
6 years ago
Because ballon is moving upward and stone dropped goes downward. Both have opposite direction of motion so you may take either of them negetive according to your convenience

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