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A rocket with a lift-off mass 2xx10^(4)k...

A rocket with a lift-off mass `2xx10^(4)kg` is blasted upwards with an initial acceleration of `5ms^(-2)`. The initial thrust of the blast is `("Take g"=10ms^(-2))`

A

`2xx10^(5)N`

B

`3xx10^(5)N`

C

`4xx10^(5)N`

D

`5xx10^(5)N`

Text Solution

Verified by Experts

The correct Answer is:
B
Here, `m=2xx10^(4)kg`
Initial accerleration, `a=5ms^(-2)`
Initital thrust=upthrust requried to impart acceleration a+upthrust required to overcome gravitational pull
`therefore F=m(a+g)=(2xx10^(4)kg)(5+10)ms^(-2)=3xx10^(5)N`
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