Kinematics Question 406

Question: From a balloon moving upwards with a velocity of $ 12m{{s}^{-1}} $ , a packet it’s released when is at a height of 65 m from the ground. 7 lie time taken by it to reach the ground it’s $ (g=10m{{s}^{-2}}) $

Options:

A) 5s

B) 8s

C) 4s

D) 7s

Show Answer

Answer:

Correct Answer: A

Solution:

$ s=ut+\frac{1}{2}at^{2} $

$ -65=12t-5t^{2} $ on solving we get, t=5s



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