Calculate the work done by the brakes of a car of mass 1000kg when its speed is reduces from 20m/s to 10m/s ?
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Answered by
13
Answer:- = 150 kJ
Step by Step Solution:-
We have given that the car is moving with a particular speed of 20m/s and later with 10m/s
So car have a Kinetic energy due to its speed. We have to work against this Kinetic Energy.
We have,
m = 1000 kg
Initial speed(u) = 20 m/s
Final Speed (v) = 10
Using Work - Energy Theorem,
Work done = m/2(u² - v²)
= 1000/2(20² - 10²)
= 500(20 + 10)(20 - 10)
= 500 × 30 × 10
= 150000 J
= 150 kJ
Answered by
8
We are given with :
Initial Velocity = u of the body = 20 m/S
Final Velocity= v of the body = 10 m/S
Mass of the body = m = 1000 kg
We know that the work done =
= 1500000 J = 150 KJ
The required work done is 150 KJ.
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