MCQ
In the graph shown in figure, which quantity associated with projectile motion is plotted along $y$-axis?


- AKinetic energy
- BMomentum
- ✓Horizontal velocity
- DNone of these

It is the horizontal component of velocity that remains constant throughout the motion as there is no acceleration in that direction $a_x=0$, $u_x=$ constant
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$U = ax^2 - bx$
Where $a$ and $b$ are positive constants. The law of the force governing the system is

[Take specific heat of water $= 1\, cal\, g^{-1}\,^oC^{-1}$ and latent heat of steam $= 540\, cal\, g^{-1}$]