1.Speed & Velocity definitions and dimensions.
Sol: Speed = $\frac{\text{Distance}}{\text{Time}}$, Velocity = $\frac{\text{Displacement}}{\text{Time}}$. SI Unit: $\text{m/s}$. Dimensional Formula: $[LT^{-1}]$.
2.Uniform acceleration definition & example.
Sol: If velocity changes by equal amounts in equal time intervals, acceleration is uniform. Example: Freely falling body under gravity ($g = 9.8 \text{ m/s}^2$).
3.Conversion of $72 \text{ km/h}$.
Sol: $72 \times \frac{5}{18} = 20 \text{ m/s}$.
4.Scalar vs Vector classification.
Sol: Distance is a Scalar quantity. Displacement is a Vector quantity.
