A balloon is rising vertically up with a velocity of 29 ms -1. A stone is dropped from it and it reaches the ground in 10 seconds. The height of the balloon when the stone was dropped from it, was ( g =9.8 ms -2)

Question

A balloon is rising vertically up with a velocity of 29 ms -1. A stone is dropped from it and it reaches the ground in 10 seconds. The height of the balloon when the stone was dropped from it, was ( g =9.8 ms -2) (A) 100 m (B) 200 m (C) 400 m (D) 150 m

Tardigrade Admin · Accepted Answer

For stone to be dropped from rising balloon of velocity 29 m / s, u =-29 m / s , t =10 sec. ∴ h = -29 × 10 + (1/2) × 9.8 × 100 = - 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 reaches the ground in $10$ seconds. The height of the balloon when the stone was dropped from it, was $(g = 9.8 m s^{- 2})$

100 m

200 m

400 m

150 m

For stone to be dropped from rising balloon of velocity $29 m / s$ ,
$u = - 29 m / s, t = 10 sec$ .
$∴ h = - 29 \times 10 + \frac{1}{2} \times 9.8 \times 100$
$= - 290 + 490 = 200 m$

Q. A balloon is rising vertically up with a velocity of 29ms−1. A stone is dropped from it and it reaches the ground in 10 seconds. The height of the balloon when the stone was dropped from it, was (g=9.8ms−2)