3. The position of a block attached to a string oscillates as x(t) = x₀ cos(ωt), where x₀ is the amplitude, ω is the angular frequency, and t is time. Therefore, the kinetic energy of the block is also a periodic function of time. What is the period of the kinetic energy? (A)(B)(C)(D)(E)

8. As shown, a charge particle q is inject into a space with uniform electric field E = E₀ x, where E₀ is the absolute value of the electric field and x is the unit vector along the x-axis. The initial velocity of the particle is v = v₀y, where y is the unit vector along the y-axis. A magnetic field B is applied into the same space to maintain the velocity of the particle. Which one of the following fields is the correct one? (A) B =(B) B = (C) B =(D) B =(E) B =

3. The position of a block attached to a string oscillates as x(t) = x₀ cos(ωt), where x₀ is the amplitude, ω is the angular frequency, and t is time. Therefore, the kinetic energy of the block is also a periodic function of time. What is the period of the kinetic energy?
(A)
(B)
(C)
(D)
(E)

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