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ICSE Class 10 Physics 2023 Paper

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A car of mass 120 kg120\ \mathrm{kg} is moving at a speed 18 km/h\text{km/h} and it accelerates to attain a speed of 54 km/h54\ \text{km/h} in 5 seconds. Calculate :
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Question : 54 of 76
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the power of the engine.
Solution:  
Given : m=120 kgm=120\,\mathrm{kg},
u=18 km/h=18×100060×60=5 m/su=18\,\mathrm{km}/\mathrm{h}=18\times\frac{1000}{60\times60}=5\,\mathrm{m}/\mathrm{s}
v=54 km/h=54×100060×60=15 m/sv=54\,\mathrm{km}/\mathrm{h}=54\times\frac{1000}{60\times60}=15\,\mathrm{m}/\mathrm{s}
Power=Worktime\text{Power}=\frac{\text{Work}}{\text{time}}
=120005=\frac{12000}{5}
=2400 watt=2400\,\mathrm{watt}
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