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veca =2veci+3vecj-2veck vecb =4veci-ve...

`veca =2veci+3vecj-2veck`
` vecb =4veci-vecj+5veck`
Find `veca xx vecb`

Text Solution

Verified by Experts

The height h is a function of time .Thus h will be maximum when dh/dt =0 `h=ut -1/2gt^2`
`dh/dt=u-1/2gxx2t=u`
For maximum h
dh/dt=0
`implies u-gt=0 `
u=gt
t=u/g
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