Verified Solution • 2025–26 Session moderate

QJEEM21Ph84d5: JEE Main 2021 Physics - Class 11 JEEM21Ph84d5 Solution: A balloon was moving upwards with a uniform velocity of 10 m/s. …

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 g as 10 m/s2)

Multiple Choice Options

  • A 300 m
  • B 200 m
  • C 125 m
  • D 250 m

Step-by-Step Verified Solution

JEE Main 2021 (Online) 25th July Evening Shift Physics - Motion in a Straight Line Question 61 English Explanation

Object is projected as shown so as per motion under gravity

S=ut+12at2S = ut + {1 \over 2}a{t^2}

−75=+10t+12(−10)t2⇒t=5- 75 = + 10t + {1 \over 2}( - 10){t^2} \Rightarrow t = 5 sec

Object takes t = 5 s to fall on ground

Height of balloon from ground

H = 75 + ut

= 75 + 10 ×\times 5 = 125 m

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