A 2.0-kg body moving along the x axis has a velocity vx = 5.0 m/s at x = 0. The only force acting on the object is given by Fx = (-4.0x) N, where x is in m. For what value of x will this object first come (momentarily) to rest?
A)4.2 m
B)3.5 m
C)5.3 m
D)6.4 m
E)5.0 m

Question

Quizplus · Accepted Answer

The work done by the force Fx = (-4.0x) N will equal the initial kinetic energy of the object. Solving for x when the kinetic energy is zero gives x = 3.5 m.

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