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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.

Text Solution

Verified by Experts

Here `u=19.6ms^(-1)`
`g=-9.8ms^(-2)`

Net displacement, s = – h Negative sign is taken because displacement is in the opposite direction of initial velocity
As `s=ut+1/2gt^2`
`:." "-h=19.6xx6+1/2xx(-9.8)xx6^2`
`=117.6-176.4=-58.8`
or h=58.8m
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