Question

Please Solve the above question given.​

Answer 1

Answer:

3 .Efficiency

Explanation:

because it helps to increase the force on object

Answer 2

Answer:

(i) 4.5s        (ii) 5      (iii) 90%

Explanation:

As we know that efficiency = mechanical advantage /velocity ratio

​  

 

(i) Mechanical Advantage(M.A) =  load/effort =  4500/1000= 4.5s

(ii) Velocity Ratio(V.R) = No. of pulleys used = 5

(iii) Therefore efficiency η =  4.5/5× 100 = 90%

​  

please mark as the brainliest answer plssss.....