A block of mass 25 kg is pulled along a horizontal surface by a force at an angle 4 5 ∘ with the horizontal. The friction coefficient between the block and the surface is 0.25. The displacement of 5 m

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A block of mass 25 kg is pulled along a horizontal surface by a force at an angle 4 5 ∘ with the horizontal. The friction coefficient between the block and the surface is 0.25. The displacement of 5 m of the block is:

TestHub · Accepted Answer

Block travels with uniform velocity So a = 0 ⇒ F cos 4 5 ∘ = friction ​ 2 ​ F ​ = μ [ mg − 2 ​ F ​ ] 2 ​ F ​ = 0.25 [ 25 × 9.8 − 2 ​ F ​ ] ⇒ 1.25 2 ​ F ​ = 61.25 F = 1.25 61.25 × 2 ​ ​ = 49 2 ​ W ext ​ = FS cos 4 5 ∘ = 49 2 ​ × 5 × 2 ​ 1 ​ = 245 J ​

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