Laws of Motion - Result Question 35

35. A mass of 1kg is suspended by a thread. It is (i) lifted up with an acceleration 4.9m/s2, (ii) lowered with an acceleration 4.9m/s2. The ratio of the tensions is

[1998]

(a) 3:1

(b) 1:2

(c) 1:3

(d) 2:1

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Answer:

Correct Answer: 35. (a)

Solution:

  1. (a) In case (i) we have

T1(1×g)=1×4.9T1=9.8+4.9=14.7N

In case (ii), 1×gT2=1×4.9

T2=9.84.9=4.9N

T1T2=14.74.9=31



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