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The graph describes an airplane's accele...

The graph describes an airplane's acceleration during its take-off run. The airplane's velocity when it lifts of at `t = 20 s` is

A

`40 ms^-1`

B

`50 ms^-1`

C

`90 ms^-1`

D

`180 ms^-1`

Text Solution

Verified by Experts

The correct Answer is:
C
`Deltav=v_f-v_i`=area under a-t graph
`v_i=0`
`rArr v_f=area`
`=40+50`
`=90m//s`
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