2. The kinetic energy of an object is 30. Find Its kinetic energy If Its mass Is doubled and Its speed Is multiplied by four.

To determine the kinetic energy in this case, what you would do is to multiply the original kinetic energy value by the proportional amounts of the mass change and the speed change.

Basically if m = 1 and speed = 1 squared where KE = 30

Then m = 2 and speed = 4 squared is when KE is 16 x 2 x 30 which would be 32 x 30 = 960 Joules.

if they have a finite resultant

see earlier answer