2. Solved Papers
  3. J & K CET Engineering

J & K CET Engineering J and K - CET Engineering Solved Paper-2010

  • question_answer
    The work done in taking an object of mass m from the surface of earth to a height \[h=R,\] where R is the radius of the earth, is

    A)  \[mgR\]

    B)  \[\frac{1}{2}mgR\]

    C)  \[\frac{1}{3}mgR\]

    D)  \[\frac{2}{3}mgR\]

    Correct Answer: B

    Solution :

    Work done \[=\Delta U=\frac{mgh}{1+\frac{h}{R}}\] \[=\frac{mg\times R}{1+\frac{R}{R}}=\frac{mgR}{2}\]


You need to login to perform this action.
You will be redirected in 3 sec spinner