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NEET2016PhysicsWork, Power and EnergyActual

A particle moves from a point - 2 i ^ + 5 j ^ to 4 j ^ + 3 k ^ when a force of 4 i ^ + 3 j ^ N is applied. How much work has been done by the force?

Options

  1. A8     J
  2. B11     J
  3. C5 J
  4. D2     J

Correct answer

C. 5 J

Step-by-step solution

S → = r → 2 - r → 1 = 4 j ^ + 3 k ^ - -   2 i ^ + 5 j ^ = 2 i ^ - j ^ + 3 k ^ F → = 4 i ^ + 3 j ^ W =   F → .   s → = 8 - 3 = 5   J

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