Solve the d. part of the 8th question.

Dear student,
(a) Length of the lever is same as the effort arm. Also, effort arm is more than load arm. So, this is a class II lever.
(b)
Concise-physics-part-ii-selina Solutions Icse Class 10 Physics Chapter - Machines 
(c) Mechanical advantage is
 
Concise-physics-part-ii-selina Solutions Icse Class 10 Physics Chapter - Machines
 
Relation between MA, efficiency and V.R. is
Concise-physics-part-ii-selina Solutions Icse Class 10 Physics Chapter - Machines
 
(d) When efficiency reduces, its mechanical advantage reduces and velocity ratio remains the same. So, when efficiency becomes 50%, M.A. = 0.9 and V.R. = 1.8


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