Question

The work done to increase the velocity of a car of 800kg from 5m/sec to 10m/sec

Answer 1

work done=change in kinetic energy
$work = \frac{1 \times 800 \times {10}^{2} }{2} - \frac{1 \times 800 \times {5}^{2} }{2} \\ work = \frac{1 \times 800(100 - 25)}{2} \\ work = 400 \times 75 = 30000j$
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