A Body Is Acted Upon by a Force of 10

question 23

Multiple Choice

A body is acted upon by a force of 10 N and undergoes displacement in the direction of the force in accordance with the relation
S = 3t² + 2t
Where the units are SI. The rate at which the force is doing work at the instant t = 2 s is

• A) 14 W
• B) 12 W
• C) 120 W
• D) 140 W
• E) 160 W

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