00:01
Hello student, so this is the given data of this problem that is mass of the automobile m is equal to 1000 kilogram and the velocity of the automobile v is equal to 90 kilometer per hour.
00:15
So here we should calculate kinetic energy of the automobile and second one what is the work to be done to stop the automobile.
00:25
So these two things we have to calculate.
00:28
So for that we have to convert this kilometer per hour into meter per second.
00:36
For that we have to divide by 3 .6.
00:43
So that should be meter per second.
00:46
So here we have 25 meter per second.
00:50
So 90 kilometer per hour is equal to 25 meter per second.
00:55
So first we have to calculate the kinetic energy that is we know that the kinetic energy is equal to 1 by 2 m v.
01:10
So by substituting the values we have 1 by 2 instead of m we should substitute 1000 and for v we have 25 meter per second.
01:26
Here we have v squared so 25 squared.
01:31
So here we have 3 .125 0 .0 joules.
01:41
So finally we have the value of kinetic energy is equal to 3 .125 into 10 power 5 joules.
02:00
Next we have to calculate the work done to stop the automobile...