A ball is thrown vertically upwards from...

A ball is thrown vertically upwards from a tower and reaches the ground in 6 seconds. Another ball is thrown downwards at same position and with same speed it reaches ground in 1.5s. Time taken by ball to reach ground if ball dropped from same height. (Take `g= 10 m/s^2`)

`3s`

`4s`

`5s`

`2`s

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