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Q.

A point-like object of mass 2.0 kg moves along the x-axis with a velocity of 4.0 m/s. A net horizontal force acting along the x-axis is applied to the object with the force-time profile shown. What is the total work that was done by the force?

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a

25 J

b

65 J

c

20 J 

d

10 J

answer is D.

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Detailed Solution

Area of curve F–t =∆P

12×5×4 = 2v-4  ⇒v = 9 m/s W = ∆k = 12×292-42= 65 J

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