Advd is initially at rest. it then begins to rotate counterclockwise with constant angular acceleration . after the dvd has rotated through an angle , its angular speed is . if instead the dvd is initially at rest and its constant angular acceleration is doubled to after the dvd has rotated through the same angle, its angular speed will be

angular speed is increased by factor

Explanation:

As we know that the angular acceleration is constant and initially the disc is at rest

so here we can say by kinematics

here we know that angle turned by the disc is

now we have

now the same disc start from rest with double angular acceleration and turned by same angle then final angular speed is given as

so here we have

1 a

2 b

3 b

4 d

5 d

6 d

explanation: