A stone thrown vertically upwards with a speed of 5 m/s attains a height of H1. Another stone thrown vertically upwards from the same point with a speed of 10 m/s attains a height H2. The correct relation will be
`H_1 = 1 / 2 H_2`
H2 = 3H1
H2 = 4H1
H1 = H2