Secondary 3 Pure Physics Questions - Help Needed

• ProjectsMates

  9 Aug 12, 17:26

   

   

   

   

   http://postimage.org/image/nqvk8wcjp/

  

• Aneslayer

  9 Aug 12, 17:52

  Can't see shit captain.jpg

• laffingshoe

  9 Aug 12, 22:48

  amount of actual work done by the box up the vertical height is mgh. 

  That will be 70N*0.03m=0.21J (Since mg = weight)

  Amount of work done by the force pushing up the inclined plane (slanted) is 0.05m*50N=0.25J

  (0.05m is the slanted height derived from pythagorian triplets)

  input work done : output work done

  0.25 : 0.21

  Ans: 25:21