Question

9.
A body is thrown vertically up with
certain initial velocity. The potential and
kinetic energies of the body are equal at a
point P in its path. If the same body is
thrown with double the velocity
upwards, the ratio of the potential and
kinetic energies of the body when its
crosses the same point, is
(a)1:1 (b)1:4
(c)1:7
(d)1:8​

Answer 1

Answer:

1:7

Explanation:

let the point =1/2 mv^2

mgh

total energy. = 2mgh

now when v is twice total m.e =8mgh

k.e= 8mgh-mgh = 7 mgh

p.e = mgh

ratio =1:7