Question

The work done in slowly pulling up a block of wood weighing 2 kN for a length of 10m on a smooth plane inclined at an angle of ${15}^0$ with the horizontal by a force parallel to the incline is :

• A. 4.36 kJ
• B. 5.17 kJ
• C. 8.91 kJ
• D. 9.82 kJ

Answer 1

Answer: (B)

R.E.F image

$w=Force\times displacement$

$=\left(2sin{15}^{\circ }\right)\times 10$

$=5.17kg$