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Question

A force of 10N displaces an object through 20cm and does the work of 1J in the process. Find the angle between the force and displacement.
  1. θ=50o
  2. θ=60o
  3. θ=35o
  4. θ=45o

A
θ=60o
B
θ=35o
C
θ=45o
D
θ=50o
Solution
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Work done,
W=F.S=FScosθcosθ=110×20×102=12θ=cos1(12)=60°

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