00:01
In the first case mass is doubled.
00:06
So m2 equals to twice of m1.
00:10
Now terminal velocity vt where is a square root of m.
00:19
So v1 by v2 equals to square root of m1 by m2.
00:26
So the final terminal velocity v2 will be v1 into m2 by m1.
00:35
So now m2 is twice of m1.
00:38
So this will be v1 into square root of so initial velocity is 39 .3 into square root of 2 meter per second.
00:53
So the final terminal velocity in this case will be 55 .5 meter per second.
01:04
Now in next case part b diameter is doubled.
01:09
So d2 equals to twice of d1 and all other things remains unchanged.
01:16
So terminal velocity here v varies as square root of 1 by a where a is the area of the ball here.
01:30
So now or we can write it as v varies as square root of 1 by d square or equal to 1 by d.
01:49
So v1 by v2 equals to d2 by d1.
01:57
So v2 equals to v1 into d1 by d2 or this equals to v1 by 2 because d2 is twice of d1.
02:15
So this is equal to 39 .3 divided by 2 meter per second...