# A car accelerates uniformly from 18 km per hour to 36 km per hour in 5 minutes. The acceleration is-

v₁ = 18 km/h, v₂ = 36 km/h

and t = 5 min = 5/60 h = 1/12 h

Acceleration, a = v₁ – v₂ / t

= 36 – 18/ 1/12

= 216 kmh⁻²

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(D) 216 kmh⁻²