A physics student monitors the speed and kinetic energy of a 0.48-kg traveling o

Question

A physics student monitors the speed and kinetic energy of a 0.48-kg traveling object. At a time of t = 1.0 s, the object is traveling with a speed of 5.5 m/s and at a time of t = 4.0 s, the object has a kinetic energy of 30 J. Determine the following.     (a) kinetic energy of the object at t = 1.0 s
1      J

    (b) speed of the object at t = 4.0 s
2      m/s ***PLEASE SHOW WORK***     (a) kinetic energy of the object at t = 1.0 s
1      J

    (b) speed of the object at t = 4.0 s
2      m/s ***PLEASE SHOW WORK***

Explanation / Answer

a) kinetic energy = 0.5*mv^2 = 0.5*0.48*5.5*5.5 = 7.26 J

b)kinetic energy = 30 = 0.5*0.48*v^2

so v = 11.18 m/s

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