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**1. Homework Statement**

A car o fmass 1250 kg accelerates from 0 to 100 km/h in 4 s . The average power of the car is ?

**2. Homework Equations**

**3. The Attempt at a Solution**

Though it looks simple , but i don see my mistake.

The average power is the change in kinetic energy over time ,

(1/2 x 1250 x 100^2)/(4)

is my working correct ? But that doesn't give the answer which is 121 kW