JEE Main 2021 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 17 March 2021, Shift 1, Physics Q12

Question 12 of 90 in this shift, Physics question 12 of 30, Section A.

A boy is rolling a 0.5 kg ball on the frictionless floor with the speed of 20 ms

^{-1}

. The ball gets deflected by an obstacle on the way. After deflection it moves with 5% of its initial kinetic energy. What is the speed of the ball now ?

(1)1.00 ms $^{-1}$
(2)4.47 ms $^{-1}$ Official answer
(3)14.41 ms $^{-1}$
(4)19.0 ms $^{-1}$

Official answer

Option 2

NTA final key.

Chapter: Work, Energy and Power
Topic: Work and Kinetic Energy
Idea tested: Kinetic Energy Calculation

Same idea in other shifts

Asked 4× in all

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Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.