Speed of sound: solids > liquids > gases. In steel ~5000 m/s, water ~1500 m/s, air ~340 m/s. Vacuum no propagation. Speed depends on density and elasticity.
Explanation:
a = constant ⇒ v = u + at (linear in t). Slope = acceleration. Memory tip: 'v-t slope = acceleration; area = displacement'. Graph interpretation frequently tested in competitive kinematics sections.
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