A car, travelling on a straight horizontal road, has 1.6 MJ of kinetic energy. It accelerates for 20 s
until it has 2.5 MJ of kinetic energy.
What is the average power output used to increase the kinetic energy of the car?
A 45 W
B 205 W
C 45kW
D 205 kW
Answers
Answered by
30
Answer:C
Explanation:
Power= Change in K.E / Time
Answered by
6
Given : A car, travelling on a straight horizontal road, has 1.6 MJ of kinetic energy. It accelerates for 20 s until it has 2.5 MJ of kinetic energy.
To Find : What is the average power output used to increase the kinetic energy of the car?
А 45W B 205 W C 45kW D 205 kW
Solution:
Power = Energy / Time
Change in Energy = 2.5 - 1.6 = 0.9 MJ
= 900 kJ
Time = 20 sec
Power = 900 /20 kJ/s
= 45 kJ/s
J/s = Watt
= 45 kW
average power output used to increase the kinetic energy of the car = 45 kW
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