Laws of Motion - Result Question 34

34. Two blocks m1=5gm and m2=10gm are hung vertically over a light frictionless pulley as shown here. What is the acceleration of the masses when they are left free?

[2000]

(a) g/3

(b) g/2

(c) g

(d) g/5

(where g is acceleration due to gravity)

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Answer:

Correct Answer: 34. (a)

Solution:

  1. (a) Let T be the tension in the string.

(i)10gT=10a

(ii)T5g=5a

Adding (i) and (ii),

5g=15aa=g3m/s2

Whe pulley have a finite mass m then acceleration,

a=m1m2m1+m2+m2



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