JEE Main 2022PhysicsWork Power EnergyEasyNumerical

JEE Main 2022 — Work Power Energy Question with Solution

JEE Main 2022 (24 Jun Shift 1)

Question

A ball of mass 100 g is dropped from a height h=10 cm on a platform fixed at the top of a vertical spring (as shown in figure). The ball stays on the platform and the platform is depressed by a distance h2. The spring constant is _____ N m-1
(Use g=10 m s-2)

Enter your answer

Show full solutionCorrect answer: 120
Correct answer
120

Step-by-step explanation

Loss in the gravitational potential energy of the ball= gain in the potential energy by the spring

-∆PEgravitational=∆PEspring

mgh+h2=12kh22⇒mg3h2=kh28

⇒k=12mgh=12×0.1×100.1=120 N m-1

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About this question

This is a previous-year question from JEE Main 2022, covering the Work Power Energy 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.