Browse by Stream
Discuss Doubts
Home
Search for Exam, Articles, Questions
get app
Go To Your Study Dashboard
  1. Home
  2. A block of mass m is kept on a platform which starts from rest with constant acceleration g/2 upward, as shown in the figure. Work done by n
# Engineering

A block of mass m is kept on a platform which starts from rest with constant acceleration g/2 upward, as shown in the figure. Work done by normal reaction on block in time t is:

Answers (1)
S safeer

By balancing the forces in vertical direction, we get:

\Rightarrow N-Mg=\frac{Mg}{2}\Rightarrow N=\frac{3mg}{2}

and displacement is given by equation:

s=ut+\frac{1}{2}at^2

where u=0 and a=g/2

\Rightarrow\vec{S}=\frac{1}{2}\vec{\frac{g}{2}}t^{2}

and we know,

W_{N}=\vec{N}.\vec{S}

\Rightarrow W=\frac{3mg^{2}t^2}{8}

Similar Questions

Preparation Products

Knockout JEE Main Sept 2020

An exhaustive E-learning program for the complete preparation of JEE Main..

₹ 12999/- ₹ 6999/-
Buy Now
Rank Booster JEE Main 2020

This course will help student to be better prepared and study in the right direction for JEE Main..

₹ 9999/- ₹ 4999/-
Buy Now
Test Series JEE Main Sept 2020

Take chapter-wise, subject-wise and Complete syllabus mock tests and get in depth analysis of your test..

₹ 4999/- ₹ 1999/-
Buy Now
Knockout BITSAT 2020

It is an exhaustive preparation module made exclusively for cracking BITSAT..

₹ 4999/- ₹ 1999/-
Buy Now
Knockout JEE Main April 2021

An exhaustive E-learning program for the complete preparation of JEE Main..

₹ 17999/- ₹ 11999/-
Buy Now
Exams
Articles
Questions