The range of the nuclear force is
Select the physical quantities in Column I and Column II having same dimensions
| $$ \text { Column I } $$ |
$$ \text { Column II } $$ |
||
|---|---|---|---|
| (A) | Entropy | (I) | Angular velocity |
| (B) | Young's modulus of elasticity | (II) | Boltzmann constant |
| (C) | Angular momentum | (III) | Energy density |
| (D) | Decay constant | (IV) | Planck's constant |
A rocket moves straight upward with zero initial velocity and with an acceleration $20 \mathrm{~m} / \mathrm{s}^2$. It runs out of fuel and stops accelerating at the end of 5th second. It reaches a maximum height and falls back to the earth. The speed when it hits the ground is (take $g=10 \mathrm{~m} / \mathrm{s}^2$ )
Two cars, at a certain instant, are 50 km apart on a line running from south to north. The one farther north is moving west at $25 \mathrm{~km} / \mathrm{h}$. The other is moving towards north at $25 \mathrm{~km} / \mathrm{h}$. How long do they take to reach their distance of closest approach?
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