Question

Please provide PROPER "SOLUTION" for the given question. (No spam)


(The answer is 1580 but I'm getting 1680, probably I did something wrong in the case of B)

Answer 1

Explanation:

The net tension in the rope is equal in magnitude to sum of the three forces or apparent weights of A, B and C, which can be calculated by multiplying their weights with their net accelerations

i.e.

F1 = W1 = m1×a1 = 60×(10+2) = 720 N

similarly

F3 = W3 = m3×a3 = 40×(10-1) = 360 N

but in case of B the acceleration is not given hece we would prefer the default acceleration = g = 10 m/s2 hence .:

F3 = m3×a3 = 50×10 = 500 N

THUS the net force = F1+F2+F3 = 720+360+500 = 1580 N

NOTE .: As the body accelerates downward the gravitational force on it decreases thus the net force is the product of its mass with the acceleration *g-a* and vice versa.