00:01
Hello, in the question it is given, consider a ball of mass, that is mass, m is equal to 0 .5 kg, and initially the ball is moving with the initial velocity, let us consider u that is equal to 5 meter per second.
00:17
And after sometimes, the velocity of the ball get decreased and it moves with the velocity 3 meter per second.
00:27
So the final velocity v is equal to 3 meter per second.
00:31
So we need to calculate the change in kinetic energy of this ball.
00:36
That is, kinetic energy, e is given by half m v squared.
00:41
So this is the general equation to calculate kinetic energy.
00:46
So when velocity is equal to 5 meter per second, then initial kinetic energy e1 will be equal to half m into initial velocity so now substituting the values here that is half into m is 0 .5 into 5 meter per second that is equal to sorry 5 square that is equal to half into 0 .5 into 25 so initial kinetic energy even will be equal to 6 .25 and the unit is so this is the value of kinetic energy when the ball is moving with the 5 meter per second...