Projectile

Q. A shell fired from ground get explodes at the highest point in its path into two pieces of equal masses. One of the pieces retraces its path. Distance between the two pieces when both lands the ground

1. $\frac{u^2\sin 2\theta }{g}$
2. $\frac{u^2\sin 2\theta }{2g}$
3. $\frac{2u^2\sin 2\theta }{g}$
4. $\frac{u^2\sin 2\theta }{4g}$

Q. A truck tows a jeep of mass $1200kg$ at a constant speed of $10ms$${}^{-1}$ on a level road. The tension in the coupling is $1000N$. If they ascend an inclined plane of $si{n}^{-1}\left(1/6\right)$ with same velocity, the tension in coupling is:

1. $2000N$
2. $2960N$
3. $1680N$
4. $1000N$