Question

A mass of 1kg is suspended by a string. It is first lifted up with an acceleration of 4.9 m/s² and then lowered down with same acceleration. The ratio of tensions in the string in the two cases, respectively is g = 9.8 m/s² ______.

Options

• 1 : 3

• 2 : 1

• 3 : 1

• 1 : 2

Answer 1

A mass of 1kg is suspended by a string. It is first lifted up with an acceleration of 4.9 m/s² and then lowered down with same acceleration. The ratio of tensions in the string in the two cases, respectively is g = 9.8 m/s² 3 : 1.

Explanation:

`a_1/a_2=(a+g)/(g-a)=(g+g/2)/(g-g/2)=(3/2)/(1/2)g=3/1`