A Body Is Acted Upon by a Force of 10

question 27

Multiple Choice

A body is acted upon by a force of 10 N and undergoes a displacement in the direction of the force in accordance with the relation s = 3t² + 2t,where s is the displacement in meters and t is in seconds.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