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A balloon was moving upwards with a unif...

A balloon was moving upwards with a uniform velocity of 10 m/s. An object of finite mass is dropped from the balloon when it was at a height of 75 m from the ground level. The height of the balloon from the ground when object strikes the ground was around :
(takes the value of gas `10 m//s^2)`

A

200 m

B

300 m

C

125 m

D

250 m

Text Solution

Verified by Experts

The correct Answer is:
C
`-75 = 10t -1/2 xx (10)t^(2)`
`rArr -15 =2t -t^(2)`
`rArr t^(2)-2t -15 =0`
`rArr t=5s `
`H = 75 +10 xx 5`
= 125 m .
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