Paper 4 OCTOBER/NOVEMBER 2002 MATHEMATICH (9709/4) A Levels
لطفا برای اطمینان از عملکرد و تجربه بهتر از مرورگرهای مدرن و به روز مانند کروم یا فایرفاکس استفاده کنید.

Two particles $P$ and $Q$ are projected vertically upwards from horizontal ground at the same instant.
The speeds of projection of $P$ and $Q$ are $12{\text{ }}m{\text{ }}{s^{ - 1}}$ and $7{\text{ }}m{\text{ }}{s^{ - 1}}$ respectively and the heights of $P$ and $Q$ above the ground, $t$ seconds after projection, are ${h_P}m$ and ${h_Q}m$ respectively. Each particle comes to rest on returning to the ground.
a) Find the set of values of $t$ for which…