Kinematics Question 198

Question: A balloon is at a height of 81 m and it’s ascending upwards with a velocity of 12 m/s. A body of 2kg weight it’s dropped from it. If g=10m/s2 , the body will reach the surface of the earth in [MP PMT 1994]

Options:

A) 1.5 s

B) 4.025 s

C) 5.4 s

D) 6.75 s

Show Answer

Answer:

Correct Answer: C

Solution:

h=ut+12gt2
81=12t+12×10×t2t=5.4sec



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