Find the work done in increasing the speed of a car from 18 km/h to 36km/h.Given the mass of car is 1000kg.
suraj31111:
time is missing i think
sorry no time displacement is missing
Answers
Answered by
33
Work Done = The Change in Kinetic Energy
= 1/2mv2 - 1/2 mu2
The Mass of car = 1000 kg
Intial Velocity = 18km/h
= 18* 5 / 18
= 5 m/s
Final Velocity = 38km/hr
= 36 * 5/18
= 2*5
= 10m/s
Work Done = 1/2 mv2 - 1/2 mu2
= 1/2 m(v2 - u2)
= 1/2 * 1000 ( 10*10-5*5)
= 500( 100-25)
= 500* 75
= 27500 joule
Answered by
4
Answer:
27500 j
Explanation:
work done=change in kinetic energy
= 1/2 mv square - 1/2 mu square
the mass of car =1000kg
initial velocity =18km/h
=18*5/18 = 5m/s
final velocity = 36km/h
=36*5/18 = 10m/s
work done = 1/2mv square -1/2mu square
1/2m(v2-u2)
1/2*1000(10*10-5*5)
500*75
27500j
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