1.

A lift is moving up with acceleration a `A` person inside the ligt throws the ball upwards with a velocity `u` relativeto hand. a. What is the time of flight of the ball? b. What is the maximum height reached by the ball in the lift?

Answer» a.`vec a_(BL)=vec a_(B)-vec a_(L) =g+a`
`vec s=vec u t+(1)/(2) vec a_(BL)t^(2), 0=uT -(1)/(2)(g+a)T_(1)^(2)`
b. `v^(2)-u^(2)=2` as
`0-u^(2)=-2 (g+a)H rArr H=u^(2)/(2 (g+a))`.


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