Join the Most Relevant JEE Main 2025 Test Series & get 99+ percentile! Join Now
Search any question & find its solution
Question: Answered & Verified by Expert
A block of mass m is kept on a platform which starts from rest with a constant acceleration g/2 upwards, as shown in the figure. Work done by normal reaction on block in time t is

PhysicsLaws of MotionJEE MainJEE Main 2019 (10 Jan Shift 1)
Options:
  • A -mg2t28
  • B m g2t28
  • C 0
  • D 3 m g2t28
Solution:
1266 Upvotes Verified Answer
The correct answer is: 3 m g2t28

N-mg=mg2
N=3mg2
s=ut+12at2
=0+12g2t2
=g4 t 2
WN=3mg2×g4 t2
=3mg2t28=3mg2t28

Looking for more such questions to practice?

Download the MARKS App - The ultimate prep app for IIT JEE & NEET with chapter-wise PYQs, revision notes, formula sheets, custom tests & much more.