Ask Questions, Get Answers

Want to ask us a question? Click here
Browse Questions
Home  >>  JEEMAIN and AIPMT  >>  Physics  >>  Class11  >>  Work, Power and Energy
0 votes

How much work is done against gravity in lifting a 3kg object through a distance of 40cm?

$\begin{array}{1 1}11.8J\\12.8J\\10.8J\\13.8J\end{array} $

Can you answer this question?

1 Answer

0 votes
Answer : 11.8J
To lift a 3kg object at constant speed,an upward force equal in magnitude to its weight,$mg=(3)(9.8N)$,must be exerted on the object.
The work done by this force is what we refer to as the work done against gravity :
Work against gravity = $mgh$
answered Aug 28, 2014 by sreemathi.v

Related questions

Ask Question
student study plans
JEE MAIN, CBSE, AIPMT Mobile and Tablet App
The ultimate mobile app to help you crack your examinations
Get the Android App