A bodyinitially at rest and sliding along a frictionlss track from a height h (as shown in the figure ) jut completes a vertical circle of diameter AB = D .the height h is equal to ……….

A bodyinitially at rest and sliding along a frictionlss track from a h

1.	A bodyinitially at rest and sliding along a frictionlss track from a height h (as shown in the figure ) jut completes a vertical circle of diameter AB = D .the height h is equal to ……….
Answer» `5/4 `D `3/2` D `7/5` D D Solution :SPEED near the vertical circle A , `v_(A) = sqrt(5gR)` where ,R = radius of circle (from the law of conservation of energy ). Potential energy is converted into kinetic energy . `mgh= 1/2 mv_(A)^(2)` ` :. H = ((v_Delta)^(2))/(2G)` ` = (5gR)/(2g)` ` = (5D)/(2xx2)` ` :. h =5/4D `