Question

Find the energy needed to increase the velocity of an object of mass 2kg from 5 m/s to 15 m/s.

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Answer 1

see the figure in attachment.

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Answer 2

Answer:

100 J

Explanation:Mass of the object (m) = 2 kg

Initial Velocity of the object (u) = 5 m/s

Final Velocity of the object (v) = 15 m/s

Kinetic Energy of the object (Ek)  = ½mv2

     = {½ x 2 x (15 - 5)2} J

     = {1 x (10)2} J

     = 100 J