A stone is projected vertically up to reach maximum height h. The ratio of its kinetic energy to its potential energy at a heighth4/5 h, will be

A stone is projected vertically up to reach maximum height h. The rati

1.	A stone is projected vertically up to reach maximum height h. The ratio of its kinetic energy to its potential energy at a heighth4/5 h, will be
Answer» `5:4` `4:5` `1:4 ` `4:1 ` Solution :At a HEIGHT `(4h)/5`, Potential energy = `mg XX (4h)/(5) = 4/5 mgh`,TOTAL energy = mgh `:.` KE at that height = `mgh - 4/5 mgh = 1/5 mgh` `:.` At a height `4/5 h `, the ratio of `(KE)/(PE) = (1/5 mgh)/(4/5 mgh) = 1/4`.