Question: (a) At a certain instant, a particle-like object is acted on by a force F = (5.40 N )i- (2.50 N ) + (7.50

(a) At a certain instant, a particle-like object is acted on by a force F = (5.40 N )i- (2.50 N ) + (7.50 N ) while the object's velocity is V = - (2.00 m/s) + (3.20 m/s) k. What is the instantaneous rate at which the force does work on the object? (b) At some other time, the velocity consists of only a y component. If the force is unchanged, and the instantaneous power is -15.0 W, what is the velocity of the object just then? (Give your answer without a unit vector.) (a) Number Units (b) Number i Units

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