Question

A ball thrown vertically upwards reaches a height hundred metre if she is equal to 10 metres per second the height at which the kinetic energy becomes 70% of the initial value

Answer 1

Answer:

The required height is 70 m

Answer 2

(h1-h2)/h1=70/100

(100-h2)/100=70/100

100-h2=70

H2=100-70=30 m