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Q: 20 N force is acting on a body. Body moves 4 meter in direction of applied force, then work done is-
  • A. 80W
  • B. 80Pa
  • C. 80N
  • D. 80J
Correct Answer: Option D - Given, Force (F)=20 N, Displacement (d) = 4 m Work done (W) = F.dcosθ [θ = 0º Displacement occurs in the direction of the force] Work = 20 N × 4 m × cos 0º Work = 20 N × 4 m × 1 Work = 80 Nm = 80 J
D. Given, Force (F)=20 N, Displacement (d) = 4 m Work done (W) = F.dcosθ [θ = 0º Displacement occurs in the direction of the force] Work = 20 N × 4 m × cos 0º Work = 20 N × 4 m × 1 Work = 80 Nm = 80 J

Explanations:

Given, Force (F)=20 N, Displacement (d) = 4 m Work done (W) = F.dcosθ [θ = 0º Displacement occurs in the direction of the force] Work = 20 N × 4 m × cos 0º Work = 20 N × 4 m × 1 Work = 80 Nm = 80 J