physics

If the resultant force acting on a 2kg object is equal to (3i+4j)N, what is the change in kinetic energy as the object moves from (7i-8j)m to (11i-5j)m?

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  1. get x motion vector
    (11i-5j) - (7i+8j) = 4 i + 3 j

    F dot x = (3 i + 4 j) dot ( 4 i + 3 j )
    = 12 + 12 = 24 Joules work done
    = change in kinetic energy

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