How much net work is required to accelerate a 1200 kg car from 10 ms-1 to 15 ms-1
JAMB Physics 2023 289 views
Source: JAMB · 2023

How much net work is required to accelerate a 1200 kg car from 10 ms-1 to 15 ms-1

How much net work is required to accelerate a 1200 kg car from 10 ms-1 to 15 ms-1

  1. 6.0 x 104 J
  2. 1.35 x 105 J
  3. 1.95 x 105 J
  4. 7.5 x 104 J ✓
Explanation

Net work equals the change in kinetic energy.

W = ½m(v² − u²) = ½ × 1200 × (15² − 10²) = 600 × (225 − 100) = 600 × 125 = 75,000 J = 7.5 × 10⁴ J.

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