You exercise with a 5.0 kg dumbbell. You need to accelerate it downward with an acceleration of 3.0 m/s². What are the magnitude and the direction of the force you need to push with? A)15 N upward B)15 N downward C)24 N upward D)49 N downward

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Quizplus · Accepted Answer

To find the force needed, use Newton's second law: F = ma. The weight of the dumbbell is 49 N (5.0 kg * 9.8 m/s²). To accelerate it downward at 3.0 m/s², the net force should be 15 N downward (5.0 kg * 3.0 m/s²). Therefore, you need to apply a force of 24 N upward to achieve this net force (49 N - 24 N = 15 N downward).

You Exercise with a 5