Waec Model Questions Vol1 2021 Physics Question 35

Practice objective / multiple choice question 35 from the 2021 Waec Model Questions Vol1 Physics examination.

Waec Model Questions Vol1 2021 Physics Objective / Multiple Choice Medium Difficulty
Question 35 WAEC_MODEL_QUESTIONS_VOL1 • 2021 • PHYSICS • objective

A 5.0 kg block is released from rest at the top of a 30° smooth incline that is 8.0 m long. The coefficient of kinetic friction varies linearly from 0.15 at the top to 0.25 at the bottom. Determine (a) the speed of the block when it reaches the bottom, and (b) the total work done by friction during the descent.

Answer Options

A. v ≈ 8.0 m\/s; work by friction ≈ -55 J
B. v ≈ 7.2 m\/s; work by friction ≈ -45 J
C. v ≈ 6.0 m\/s; work by friction ≈ -80 J
Correct Answer D. v ≈ 7.2 m/s; work by friction ≈ -68 J
Correct Answer
D
Correct Option:
v ≈ 7.2 m/s; work by friction ≈ -68 J

About This Question

This is Waec Model Questions Vol1 2021 Physics Question 35. It is one of the objective questions from the 2021 Waec Model Questions Vol1 Physics examination.

Difficulty level: Medium .

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