A balloon is rising vertically up with a velocity of 29 ms-1. A stone is dropped from it and it reached ground in 10 seconds. The height of the balloon when the stone was dropped from it is

Question

A balloon is rising vertically up with a velocity of 29 ms-1. A stone is dropped from it and it reached ground in 10 seconds. The height of the balloon when the stone was dropped from it is (A) 400 m (B) 150 m (C) 100 m (D) 200 m

Tardigrade Admin · Accepted Answer

For a stone which is thrown downwards from a balloon rising upwards, the equation of motion is h =- ut +(1/2) gt 2 =-29 × 10+(1/2) × 9.8 ×(10)2 =-290+490 =200 m .

Q. A balloon is rising vertically up with a velocity of $29 m s^{- 1}$ . A stone is dropped from it and it reached ground in $10$ seconds. The height of the balloon when the stone was dropped from it is

400 m

150 m

100 m

200 m

For a stone which is thrown downwards from a balloon rising upwards, the equation of motion is
$h = - u t + \frac{1}{2} g t^{2}$
$= - 29 \times 10 + \frac{1}{2} \times 9.8 \times (10)^{2}$
$= - 290 + 490$
$= 200 m .$

Q. A balloon is rising vertically up with a velocity of 29ms−1. A stone is dropped from it and it reached ground in 10 seconds. The height of the balloon when the stone was dropped from it is