JEE Main 2020PhysicsMotion In One DimensionHardMCQ

JEE Main 2020 — Motion In One Dimension Question with Solution

JEE Main 2020 (05 Sep Shift 1)

Question

A helicopter rises from rest on the ground vertically upwards with a constant acceleration g. A food packet is dropped from the helicopter when it is at a height h. The time taken by the packet to reach the ground is close to [g is the acceleration due to gravity]:

Choose an option

Show full solutionCorrect option: C
Correct answer
Ct=3.4hg

Step-by-step explanation

⇒For upward motion of helicopter

v2=u2+2as

v2=0+2gh

v=2gh

⇒ Now particle will start moving under gravity.

s=ut+12at2

-h=2ght-12gt2

then t=2gh±2gh+4×g2×h2×g2

t=2ghg(1+2)

t=2hg(1+2)
 

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About this question

This is a previous-year question from JEE Main 2020, covering the Motion In One Dimension chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.