Q8 / 92 · NTA Abhyas (JEE Main) 2020 · Physics · Work Power Energy

A disc of radius 0.1 m rolls without sliding on a horizontal surface with a velocity of 6 m s-1. It then ascends a smooth continuous track as shown in the figure. The height (in m) up to which it will ascend is : ( g=10 m s-2 )

Figure

Correct answer: 2.7

Solution

12Iw2+12mv2=mgh 

12mr22.v2R2+12mv2=mgh

v24+v22=gh

v2+2v24=gh

34×36=10×h

2710=h⇒2.7

Hence, the correct answer is 2.7.

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