Laws Of Motion Question 204

Question: A mass 1 kg 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 [CBSE PMT 1998]

Options:

A) 3 : 1

B) 1 : 3

C) 1 : 2

D) 2 : 1

Show Answer

Answer:

Correct Answer: A

Solution:

T1=m(g+a)=1×(g+g2)=3g2

T2=m(ga)=1×(gg2)=g2 T1T2=31



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