1.

A ball is thrown vertically upwards with a velocity of `98m//s`. Calculate (i) The maximum height to which it rises. (ii) Total time it takes to return to earth.

Answer» Here, `u=98 m//s, v=0, a=-9.8M//S^(2)`
`s=h=? T=?`
From `v^(2)-u^(2)=2` as
`0-(98)^(2)=2(-9.8)h`
`h=(98xx98)/(2xx9.8)=490m`
from `v=u-g t`
`0=98-9.8t, t=98/9.8=10s`
total time to return to earth, `2t=20 s`.


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