An object is acted upon by the three forces shown. In order to move the object upward,
A. an upward force of at least 55 N must be applied.
B. an upward force of at least 25 N must be applied.
C. an upward force of at least 5 N must be applied.
D. any upward force can be applied.
E. an upward force of at least 30 N must be applied.
Answer: D
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