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QNEET-2016-Ph-1150: NEET 2016 Physics - Class 11 NEET-2016-Ph-1150 Solution: A particle moves from a point \((-2 {i} + 5 {j})\) to \((4 {j}…
A particle moves from a point to when a force of is applied. How much work has been done by the force? 8 J 11 J 5 J 2 J
Multiple Choice Options
- A 8 J
- B 11 J
- C 5 J
- D 2 J
Step-by-Step Verified Solution
Here r 1 _ = ( _ 2 i ^ + 5 j ^ ) m
r 2 _ = ( _ 4 j ^ + 3 k ^ ) m
F _ = ( 4 i ^ + 3 j ^ ) N
Work done by force F in moving from r 1 _ and r 2 _
W = F _ ( r 2 _ _ r 1 _ )
_ W = ( 4 i ^ + 3 j ^ ) ( 4 j ^ + 3 k ^ + 2 i ^ _ 5 j ^ )
_ W = ( 4 i ^ + 3 j ^ ) . ( 2 i ^ _ j ^ + 3 k ^ )
_ W = 8 + ( _ 3 ) = 5 J