Question

The work done in pulling up a block of wood weighing 2kN for a length of 10 m on a smooth plane inclined at an angle of $15 ^ { \circ }$with the horizontal is (sin 15^o = 0.259)

• A. 4.36 k J
• B. 5.17 k J
• C. 8.91 k J
• D. 9.82 k J

Answer 1

Answer: (B)

5.17 k J

Answer 2

Work done = mg × h

$= 2 \times 10 ^ { 3 } \times l \sin \theta$