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A ball throuwn vertically upwards with a...

A ball throuwn vertically upwards with a speed of `19.6ms^(-1)` from the top of a tower returns to the earth in 6s. Find the height of the tower.

A

`40` m

B

`58.8` m

C

`50` m

D

`70` m

Text Solution

Verified by Experts

The correct Answer is:
B
`{:(u=-19.6"ms"^(-1),a=9.8"ms"^(-2),t=6s):}`
`S=ut+(1)/(2)at^(2)`
`S=-19.6xx6+(1)/(2)xx9.8xx6^(2)`
`=-19.6xx6+4.9xx36`
`S=58.8` m
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