A Block Is Attached to the End of an Ideal

question 60

Multiple Choice

A block is attached to the end of an ideal spring and moved from coordinate x_i to coordinate x_f.The relaxed position is at x = 0.The work done by spring is positive if:

• A)x_i = 2 cm and x_f = 4 cm
• B)x_i = -2 cm and x_f = 4 cm
• C)x_i = -2 cm and x_f = -4 cm
• D)x_i = 2 cm and x_f = -4 cm
• E)x_i = -4 cm and x_f = -2 cm