On a velocity–time curve, two nearby points are (4.95 s, 24.50 m/s) and (5.05 s, 25.50 m/s). Estimate the gradient of the tangent at $t = 5$ s.

• A100 m/s²
• B5 m/s²
• C10 m/s²
• D1 m/s²

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