Question

A ball is thrown up with an certain velocity it attains a gravitational and potential energy of 10 joule what will be the potential energy of it(g=10ms) a)mass is doubled b)height is reduced to half c) mass is double and height is raised 3 times the original value

Answer 1

when it is thrown its mass become more and when coming closer to the earth the weight increase and mass become same in all conditions

Answer 2

P. E = mgh
(a) if mass doubles
P. E=2mgh

(b) height reduces to 1/2
P.E=mgh/2

(c) mass doubles, height becomes 3 times
P. E= 2*3*mgh
= 6mgh


Hope it helps you