MHT CET 2020 Physics Solved Paper

The tension T1 at the topmost point is given by
T1=‌

mv12

20

−mg
Centrifugal force acting outward while weight acting downward. The tension T2 at the lowest point
T2=‌

mv22

20

+mg
Centrifugal force and weight (both) acting downward T2−T1=‌

mv22−mv12

20

+2mg
v12=v22−2gh
or v22−v12=2g(40)=80g
∴‌‌T2−T1=‌

80mg

20

+2mg=6mg