Physics

Problem

Two balls P and Q are projected vertically upward from the same point with speeds

15\,\text{m}\,\text{s}^{-1}

and

30\,\text{m}\,\text{s}^{-1}

respectively. Ignoring air resistance, what are the ratios (i) of their maximum heights

H_{P}:H_{Q}

and (ii) of the times taken to reach those heights

t_{P}:t_{Q}

? a)

1:2

and

1:2

1:4

and

1:4

1:4

and

1:2

4:1

and

2:1