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.…

A particle moves from a point - 2i^+5j^ to 4j^+3k^ when a force of 4i^+3j^ N is applied. How much work has been done by the force?
  1. 8  J
  2. 11  J
  3. 5  J
  4. 2  J

Solution

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

Asked in: NEET 2016 (Phase 2)

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