Neco 2020 Physics Question 49

Practice objective / multiple choice question 49 from the 2020 Neco Physics examination.

Neco 2020 Physics Objective / Multiple Choice Medium Difficulty
Question 49 NECO • 2020 • PHYSICS • objective

A \(3\,\text{kg}\) block is released from rest at the top of a rough incline that is \(5\,\text{m}\) long and makes an angle of \(30^{\circ}\) with the horizontal. The coefficient of kinetic friction between the block and the incline is \(\mu_{k}=0.28\). The block reaches the bottom in \(2.0\,\text{s}\). (a) Calculate the work done by friction during the descent. (b) Determine the kinetic energy of the block at the bottom. (c) Find the average power delivered by gravity during the motion.

Answer Options

A. (a) \\(-28.0\\,\\text{J}\\); (b) \\(45.0\\,\\text{J}\\); (c) \\(40.0\\,\\text{W}\\)
B. (a) \\(-42.5\\,\\text{J}\\); (b) \\(30.0\\,\\text{J}\\); (c) \\(33.3\\,\\text{W}\\)
C. (a) \\(-30.0\\,\\text{J}\\); (b) \\(35.0\\,\\text{J}\\); (c) \\(32.0\\,\\text{W}\\)
Correct Answer D. (a) \(-35.6\,\text{J}\); (b) \(38.2\,\text{J}\); (c) \(36.8\,\text{W}\)
Correct Answer
D
Correct Option:
(a) \(-35.6\,\text{J}\); (b) \(38.2\,\text{J}\); (c) \(36.8\,\text{W}\)

About This Question

This is Neco 2020 Physics Question 49. It is one of the objective questions from the 2020 Neco Physics examination.

Difficulty level: Medium .

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