A projectile is fired vertically upwards with an initial velocity \[u\]. After an interval of T seconds, a second projectile is fired vertically upwards, also with initial velocity \[u\].

They meet at time \[t=\frac{u}{g}\] and at a height \[\frac{{{u}^{2}}}{2g}+\frac{g{{T}^{2}}}{8}\]

They meet at time\[t=\frac{u}{g}+\frac{T}{2}\] and at a height \[\frac{{{u}^{2}}}{2g}+\frac{g{{T}^{2}}}{8}\]

They meet at time \[t=\frac{u}{g}+\frac{T}{2}\] and at a height \[\frac{{{u}^{2}}}{2g}-\frac{g{{T}^{2}}}{8}\]

A projectile is fired vertically upwards with an initial velocity \[u\

1.	A projectile is fired vertically upwards with an initial velocity \[u\]. After an interval of T seconds, a second projectile is fired vertically upwards, also with initial velocity \[u\].
A.	They meet at time \[t=\frac{u}{g}\] and at a height \[\frac{{{u}^{2}}}{2g}+\frac{g{{T}^{2}}}{8}\]
B.	They meet at time\[t=\frac{u}{g}+\frac{T}{2}\] and at a height \[\frac{{{u}^{2}}}{2g}+\frac{g{{T}^{2}}}{8}\]
C.	They meet at time \[t=\frac{u}{g}+\frac{T}{2}\] and at a height \[\frac{{{u}^{2}}}{2g}-\frac{g{{T}^{2}}}{8}\]
D.	They never meet
Answer» D. They never meet