Kinematics Question 165

Question: A particle is thrown up inside a stationary lift of sufficient height. The time of flight it’s T. Now is thrown again with same initial speed v0 with respect to lift. At the time of second throw, lift is moving up with speed v0 and uniform acceleration g upward (the acceleration due to gravity). The new time of flight it’s

Options:

A) 2T

B) T2

C) T

D) 2T

Show Answer

Answer:

Correct Answer: B

Solution:

[b] with respect to lift initial speed = v0

Acceleration = -2g Displacement = 0

S=ut+12at2

0=v0T+12×2g×T2

T=v0g=12×2v0g=12T



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