A 7.5-kg object passes through the origin at time t = 0 such the its x component of velocity is -7.0m/s and its y component of velocity is 4.0m/s.  What is the kinetic energy of the object at this time?                 2.At a later time t = 3.0s the particle is located at x = 2.5m and y = 8.4m. What constant force acted on the object during this time interval

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