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JEE Main 2024 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 6 April 2024, Shift 1, Physics Q34

Question 34 of 90 in this shift, Physics question 4 of 30, Section A.

A train starting from rest first accelerates uniformly up to a speed of 80

km/h

for time

t

, then it moves with a constant speed for time

3t

. The average speed of the train for this duration of journey will be (in

km/h

) :

(1)70Official answer
(2)30
(3)40
(4)80

Official answer

Option 1

NTA final key.

Chapter: Motion in a Straight Line
Topic: Kinematics in 1D
Idea tested: Acceleration-Deceleration Motion Profiles

Same idea in other shifts

Asked 2× in all

17 Mar 2021, Shift 1 · Q1A car accelerates from rest at a constant rate $\alpha$ for some time after which it decelerates at a constant rate $\beta$ to come to…MediumSingle correct

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.